Monday, April 24, 2023

SpaceX launches most powerful rocket in history in explosive debut – like many first liftoffs, Starship’s test was a successful failure

Starship, the most powerful rocket ever built, launched from a spaceport in Texas. AP Photo/Eric Gay)
Wendy Whitman Cobb, Air University

On April 20, 2023, a new SpaceX rocket called Starship exploded over the Gulf of Mexico three minutes into its first flight ever. SpaceX is calling the test launch a success, despite the fiery end result. As a space policy expert, I agree that the “rapid unscheduled disassembly” – the term SpaceX uses when its rockets explode – was a very successful failure.

A large rocket standing next to a tower.
The full Starship stack comprises a Starship spacecraft (in black) on top of a rocket dubbed Super Heavy (in silver) and is nearly 400 feet (120 meters) tall. Hotel Marmot/Flickr, CC BY-SA

The most powerful rocket ever built

This launch was the first fully integrated test of SpaceX’s new Starship. Starship is the most powerful rocket ever developed and is designed to be fully reusable. It is made of two different stages, or sections. The first stage, called Super Heavy, is a collection of 33 individual engines and provides more than twice the thrust of a Saturn V, the rocket that sent astronauts to the Moon in the 1960s and 1970s.

The first stage is designed to get the rocket to about 40 miles (65 kilometers) above Earth. Once Super Heavy’s job is done, it is supposed to separate from the rest of the craft and land safely back on the surface to be used again. At that point the second stage, called the Starship spacecraft, is supposed to ignite its own engines to carry the payload – whether people, satellites or anything else – into orbit.

An explosive first flight

While parts of Starship have been tested previously, the launch on April 20, 2023, was the first fully integrated test with the Starship spacecraft stacked on top of the Super Heavy rocket. If it had been successful, once the first stage was spent, it would have separated from the upper stage and crashed into the Gulf of Mexico. Starship would then have continued on, eventually crashing 155 miles (250 kilometers) off of Hawaii.

During the SpaceX livestream, the team stated that the primary goal of this mission was to get the rocket off the launch pad. It accomplished that goal and more. Starship flew for more than three minutes, passing through what engineers call “max Q” – the moment at which a rocket experiences the most physical stress from acceleration and air resistance.

A cloud of fire and smoke in the sky with pieces falling Earthward.
The Starship spacecraft and Super Hheavy rocket were unable to separate during the flight, so engineers blew up the full rocket. AP Photo/Eric Gay

According to SpaceX, a few things went wrong with the launch. First, multiple engines went out sometime before the point at which the Starship spacecraft and the Super Heavy rocket were supposed to separate from each other. The two stages were also unable to separate at the predetermined moment, and with the two stages stuck together, the rocket began to tumble end over end. It is still unclear what specifically caused this failure.

Starship is almost 400 feet (120 meters) tall and weighs 11 million pounds (4.9 million kilograms). An out-of-control rocket full of highly flammable fuel is a very dangerous object, so to prevent any harm, SpaceX engineers triggered the self-destruct mechanism and blew up the entire rocket over the Gulf of Mexico.

All modern rockets have mechanisms built into them that allow engineers to safely destroy the rocket in flight if need be. SpaceX itself has blown up many of its own rockets during testing.

Success or failure?

Getting to space is hard, and it is not at all unusual for new rockets to experience problems. In the past two years, both South Korea and Japan have attempted to launch new rockets that also failed to reach orbit. Commercial companies such as Virgin Orbit and Relativity Space have also lost rockets recently. None of these were crewed missions, and in most of these failed launches, flight engineers purposefully destroyed the rockets after problems arose.

SpaceX’s approach to testing is different from that of other groups. Its company philosophy is to fail fast, find problems and fix them with the next rocket. This is different from the more traditional approach taken by organizations such as NASA that spend far more time identifying and planning for possible problems before attempting a launch.

The traditional approach tends to be slow. The development of NASA’s Space Launch System – the rocket that will take astronauts to the Moon as part of the Artemis program – took more than 10 years before its first launch this past November. SpaceX’s method has allowed the company to move much faster but can be costlier because of the time and resources it takes to build new rockets.

SpaceX engineers will look to identify the specific cause of the problem so that they can fix it for the next test launch. With this approach, launches like this first Starship test are successful failures that will help SpaceX reach its eventual goal of sending astronauts to Mars.

Wendy Whitman Cobb, Professor of Strategy and Security Studies, Air University

This article is republished from The Conversation under a Creative Commons license.

Chemistry on paper may make diagnoses cheap and portable


Next-gen microfluidic sensors could improve health monitoring at home and far afield

The home pregnancy test is a bit of a marvel. Cheap and quick, it provides vital information to women in the privacy of their homes. New diagnostic health tests that are similarly inexpensive and easy to use could be a boon for public health, and some chemists have turned to a surprisingly flimsy material for help: paper.

Paper-based sensors could make it easier for people around the world to assess their own health, helping with the in-home management of chronic conditions such as cardiovascular disease and perhaps even facilitating the early detection of cancer and other illnesses. In countries vulnerable to dangerous contagions such as Ebola, the sensors might also provide early warnings of an outbreak.

Paper-based tests already are used to detect problems in urine, to help diagnose influenza and strep throat, and to manage diabetes, among other applications. The continued success of these tools, which are designed to give quick results on the spot, will depend on a handful of factors, according to the World Health Organization. They’ll have to be affordable, sensitive and specific. And they’ll need to be user-friendly, fast and able to be interpreted without any other equipment. Microfluidic paper-based analytical devices, also known as micro-PADs or just PADs, fit the bill.

Essentially a tiny, self-contained lab on a handheld paper card or strip, the micro-PAD was conceived in the mid-twentieth century; more modern experimental devices were introduced in 2007. Since then micro-PAD researchers have experimented with increasingly complex designs that process samples, control the flow of fluid, amplify signals and perform other tasks. They can contain liquid samples within hydrophobic boundaries printed with wax and other materials, use three-dimensional structures to control the flow rate of samples, direct flow paths with valves that operate without instrumented controllers or actuators, deliver reagents in a predetermined order, and display test results.

Despite being made of paper, the 3D structures can be quite intricate in design. Some are inspired by the centuries-old art of origami. “They transform a simple 2D, lateral-flow test strip into a sophisticated, 3D device” for portable chemistry, says University of Florida researcher Z. Hugh Fan. Still, major technological obstacles must be overcome before micro-PADs are more widely used, including improving their sensitivity and ability to detect several biomarkers at once, Fan says.

Displaying clear test results has also proved difficult for micro-PAD designers, due partly to the innate characteristics of paper, which is opaque and autofluorescent. “Most micro-PADs are based on colorimetric detection,” Fan says. Some progress has been made by pairing the devices with smartphones to more precisely detect color changes and better interpret results.

“I am hopeful that μPADs will be used for screening infectious diseases in hospitals and in resource-poor regions in the near future,” he says.

This article originally appeared in Knowable Magazine, an independent journalistic endeavor from Annual Reviews.

Russia’s legal interpretation of ‘espionage’ has broadened since the Soviet era – as the case of Evan Gershkovich shows

The Wall Street Journal reporter Evan Gershkovich faces up to 20 years behind bars on espionage charges. Sefa Karacan/Anadolu Agency via Getty Images
William E. Butler, Penn State

The case of Wall Street Journal correspondent Evan Gershkovich, who on April 18, 2023, saw his appeal against investigative detention on spying charges turned down by a Russian court, has echoes of an earlier era. Not since the Cold War, the Kremlin noted, has an American journalist been charged with espionage in the former Soviet Union.

But as a longtime specialist on Russia’s legal system, I am aware that the charges levied against Gershkovich are a product of modern Russia – and that could have worrying consequences for the journalist.

Foreign agents and state secrets

The legislation on espionage in Russia is no longer the same as that of the former Soviet Union. On July 14, 2022, Article 276 of the Russian Criminal Code amended the definition of “espionage.”

Under the revised version of Article 276, espionage now constitutes “the transfer, collecting, stealing, or keeping for the purpose of transfer to a foreign State, international or foreign organization, or of their representatives, of information comprising a state secret.”

If such an act was committed by a foreign citizen or stateless person – that is, a person having no citizenship – then it constitutes espionage, the code provides.

This amended text broadened the definition considerably. The Gershkovich case appears to be the first involving a journalist under the expanded definition.

Precisely what information Gershkovich is believed by the Russian authorities to have acquired or collected is not a matter of public record. The FSB, Russia’s security service, has put the accusations in fairly vague terms, saying the journalist was caught “collecting classified information” on Russia’s “military industrial complex” during a trip to Ekaterinburg, around 1,400 kilometers (880 miles) east of Moscow. The FSB added that Gershkovich was “acting on instructions from the American side.”

The journalist’s employer, The Wall Street Journal, has vigorously denied that its reporter was involved in espionage. The U.S. State Department has likewise said that Gershkovich has been “wrongfully detained” and called for his release.

Either way, under Russian espionage law the newspaper would be regarded as a foreign organization – that is, an entity created under the law of a foreign country.

Years of detention – or a deal?

So what lies ahead in the criminal proceedings over Gershkovich’s case? Under the Russian Criminal Code, the crime of espionage requires “direct intent” to be proved by the prosecution.

“Direct intent” is defined under Russian law as being aware of the social danger of one’s actions, or foreseeing the possibility – or inevitability – of consequences that are deemed to create a danger to society.

The prosecution will be seeking to prove that Gershkovich handled, sought to acquire, actually acquired, or had in his possession state secrets. Although the definition of what constitutes a state secret is narrower than during the Soviet era, it nonetheless remains quite extensive and would include the information that Gershkovich is accused to have accessed.

Should Gershkovich be convicted of espionage, the punishment prescribed by the criminal code is deprivation of freedom for a term of from 10 to 20 years. Russian criminal law refers to “deprivation of freedom” because while it may be served in a prison if the individual is dangerous to others, for most it takes the form of detention in some kind of camp where the prisoners share accommodation.

It is probable that the Russian authorities will detain Gershkovich in an investigative cell, probably shared with someone else, while the legal proceedings continue.

Gershkovich’s legal counsel invited the court on April 18 to replace investigative detention with either house arrest, potentially at Gershkovich’s Moscow address, or financial security, through a pledge or bail.

Either would have been possible under Russia’s Code of Criminal Procedure. But both were declined by the court.

The investigation will now continue until trial unless Russia and the United States come to another arrangement.

William E. Butler, Distinguished Professor of Law, Penn State

This article is republished from The Conversation under a Creative Commons license.

What helps some people diagnosed with cancer, heart disease or diabetes stay relatively happy and healthy, while others are devastated? Psychologist Vicki Helgeson explains the traits and mindsets that can make the difference.

People everywhere are living longer than ever. The average global life expectancy has more than doubled since 1900 and now exceeds 70 years. Vaccines and antibiotics have reined in scourges like polio, tuberculosis and pneumonia, which can strike young and old people alike. This helps explain why diseases that have long been more common in the elderly, such as cancer and cardiovascular ailments, are today leading causes of mortality, making up more than 35 percent of all deaths. In the United states, roughly half of all adults suffer from at least one sort of ongoing, incurable illness, including cancer, multiple sclerosis, rheumatoid arthritis and diabetes.

Considering how painful and disabling these conditions can be, it’s no surprise that people with chronic illnesses are two to three times more likely than the general population to suffer from depression. That risks a downward spiral in which a patient may stop keeping up with treatments and other self-care, such as diet and exercise, and sink further into despair as health inevitably declines. Yet people differ dramatically in the way they respond to being ill. While some surrender hope, others become determined to do all they can to maintain or improve their health, with some even finding silver linings in their diagnoses.

Vicki Helgeson, a psychologist at Carnegie Mellon University, in Pittsburgh, Pennsylvania, has spent more than 25 years studying how people adjust to chronic illness. “Most people are amazingly resilient and find successful ways of coping with whatever stressors life throws their way,” she says. Still, a large minority with the same severity of illness will suffer more, both physically and emotionally. Studies show that the factors that make the difference include gender, personality traits and, perhaps most importantly, relationships with friends, family and peers.

Writing in the 2017 Annual Review of Psychology, Helgeson and graduate student Melissa Zajdel described evidence from more than 150 studies analyzing what makes some people more resilient and others more vulnerable to chronic illness. Knowable recently spoke with Helgeson about what she has learned from that literature as well as from her clinical experience supporting chronically ill patients. This conversation has been edited for length and clarity.

Why is there such a wide range of outcomes for people living with chronic illness?

How patients fare after being diagnosed with chronic illnesses depends a lot more on them than on their doctors. The patient has to be taking medication, monitoring diet, exercising and following up with medical appointments, all of which can make a big difference in how well he or she does, both psychologically and physically.

At the same time, having a chronic illness will mean different things to different people, and to different people at different stages of the disease. For some people, having a chronic illness completely changes the way they think about themselves; among people who are equally physically impaired, some will see themselves as much more altered than others. For instance, one study of men with prostate cancer showed that one-third said they felt less masculine. In a study comparing heterosexual women and lesbians with breast cancer, the lesbians reported less concern about their appearance.

How many people are we talking about?

These are big numbers. About 85.6 million people in the United States are living with some cardiovascular disease or the aftereffects of a stroke. Some 14.5 million have a history of cancer or are living with cancer. And roughly 29.1 million have been diagnosed with diabetes.

Additionally, some 24 million US adults, more than 10 percent of the adult population, are limited in their activities because of arthritis. Just over 1 million are living with HIV, and another 1 million people have been diagnosed with multiple sclerosis.

How did you come to be interested in this subject?

I’ve been interested in gender and health for many years. Back in graduate school, I wrote my dissertation on the role of masculinity in heart disease; I was really intrigued by the ways we socialize men that might harm their health. For instance, we encourage men to be independent and physically and mentally strong, which translates into men not seeking help when they need it, whether that help is going to a doctor or simply disclosing a problem to someone.

In more recent years I’ve zeroed in on the personality traits of “agency” and “communion” in health, in particular “unmitigated agency,” more often found in men, which is a focus on the self to the exclusion of others, and “unmitigated communion,” more often found in women, which is to focus on others to the exclusion of self. Both of these characteristics can play a large role in physical health in general and in particular how someone copes with chronic illness. For example, a woman who is chronically ill will often try to continue to care for her family, even at the cost of caring less well for herself.

Many of the studies you cite indeed suggest that gender makes a big difference when it comes to chronic illness, both in the kinds of illnesses we get and the way we react to them.

Research shows that compared to men, women have more nonfatal chronic illnesses, mainly autoimmune diseases such as lupus, rheumatoid arthritis and multiple sclerosis, while men have more chronic illnesses that are likely to be fatal, such as heart disease and cancer. So overall, women live longer than men, but women are also more likely than men to live with disease.

And you have also found that, in general, women who are chronically ill have a harder time with it emotionally than do men.

We did find this to be the case, but it’s complicated. It’s true that when women are chronically ill — for instance with something like type 2 diabetes — on average and compared with men, women report being more depressed and more physically limited due to the illness. (There are a few exceptions to this rule: One study showed that men with heart failure perceived their health as being worse than women with similar illness.)

The complication is that even when we’re physically healthy, women suffer more from emotional problems than do men. In the general population, women are twice as likely as men to be depressed. So I can’t say that women with chronic illnesses are more depressed than men due to the illness, specifically. The research just isn’t clear. What I can say is that the way we socialize males versus females can have a negative impact on how both men and women adjust to chronic illness. For women, the issue is that we may try to resume our role as caregivers. For men, the issue is they may try to appear strong and self-reliant and be unwilling to ask for help.

One particularly striking finding you report is that a woman will suffer more than a man whether she herself is ill or is caring for a man with a chronic illness.

This may be because, in general, women are socialized to be more other-focused than men, while men are socialized to be more self-focused. If you’re more other-focused, it may be more difficult for you to take care of yourself when you’re ill. You may also be more vulnerable to emotional contagion when your spouse is ill.

Wasn’t the feminist revolution supposed to have done away with all that self-sacrificing?

There have definitely been some changes. Women are socialized now to have more agency and be more assertive — but not at the expense of giving up that “other” orientation.

What about race as a factor in how people fare with chronic illness?

It clearly has an effect. Black people with diabetes, for instance, on average report greater distress related to their condition and greater interference with their daily activities than do whites with the same illness. Non-whites with heart disease on average have a greater decline in functioning over five years. But it’s hard to get clear explanations of what is happening here, since race and ethnicity may also be linked to lower incomes and the unhealthy environmental conditions that can come with them, from more pollution to poor-quality medical care.

When you think back on all the research you have done, including for your review article, what has most surprised you about how people cope with chronic illness?

I’ve been struck by how important it is for someone facing a diagnosis to have some sense of control. People who have a high sense of control tend to believe that they can influence their health. So when faced with chronic illness, a person with a high sense of control is more likely to take actions that might actually influence the course of their disease — such as taking medication and exercising, and so on.

You can’t control everything of course, and you don’t really get to decide what you can control, but when you figure out what you can, it enhances your feelings of self-worth and reduces distress. It’s like the Serenity Prayer, about accepting what you can’t change while having the courage to change what you can and the wisdom to know the difference. And then you might ask, what happens if treatment fails and the disease comes back? Are you worse off having believed you had control? No, you’re not. It’s always better to figure out a way to have some control. If you have a high sense of control over what happens to you, you’ll try harder to take care of yourself and manage the disease.

I remember meeting a woman who was undergoing angioplasty, a procedure intended to open the coronary arteries. Some portion of these operations fail in the sense that the benefits don’t last that long. After three months, the problem returned, and she chose to try angioplasty for a second time. It again failed to take. She then had a third angioplasty, and once again ended up requiring further treatment. Finally she had bypass surgery, and you might think she’d have said should have just had the bypass surgery at the beginning, but instead she said, “I’m just thrilled there was another available treatment!” That kind of attitude can be quite helpful. I don’t know if people with that attitude live longer, but they’re happier and healthier while they’re living.

What other sorts of attitudes can make a difference?

I subscribe to Shelley Taylor’s cognitive adaptation theory, which characterizes the kind of person most able to deal with a chronic illness. Generally, it’s the kind of person who has a high sense of self-esteem and self-worth, who sees his or her life as worthwhile. This kind of person may even be more likely to find benefits in the seemingly bad news of a diagnosis.

Twenty years ago I did a lot of work on breast cancer. A common response was for women to say, quite seriously, that it was the best thing that ever happened to them. One woman actually said that given a choice between cancer and winning the Tour de France, she’d choose cancer, because she had learned so much from it. Another said her illness had inspired her to leave her husband — she wouldn’t have done that otherwise. Someone else might say having a heart attack was a blessing that brought him closer to his family, made him slow down at work and pay attention to more important things. With respect to diabetes, someone might say I now pay more attention to myself, to exercising and eating better.

But what do you think about Barbara Ehrenreich’s argument in her book, Bright-Sided: How the Relentless Promotion of Positive Thinking Has Undermined America? She wrote it after being diagnosed with breast cancer, when she says she was made to feel that if she didn’t get better, it was her fault for not being optimistic enough.

Yes, I agree that can be harmful. It’s helpful for people to find the good in the bad, but doing so can actually also be a form of avoidance. It’s a problem we have in our culture where we don’t want to hear about bad news and stress, and then someone might react against that, saying, “This is crazy; I’m trying to tell you I’m upset about something and you say I should just focus on the good things.”

There are data that show this can be distressing to people with cancer. It makes them feel not validated and not heard. People want to be able to disclose their concerns and feel listened to and understood — they don’t want people to invalidate their feelings by trivializing their problems or telling them to cheer up.

So is there one single thing that can make the most difference in how we cope with chronic illness?

Yes! Having good relationships! It’s very important to find at least one person who will listen to you and let you be yourself. They don’t have to have the same illness.

There is a lot of research showing that being embedded in a social network is good for psychological health and physical health. And there are all kinds of reasons for that. Being involved in relationships means that there is someone to notice if you are having a problem, someone urging you to go to the doctor or encouraging you to eat healthy food, someone depending on you, which motivates you to take care of yourself, someone to listen to you, someone to depend on for assistance. Not everyone has this in their lives, which is unfortunate, as some large-scale studies have even linked such relationships with reduced mortality.

This article originally appeared in Knowable Magazine, an independent journalistic endeavor from Annual Reviews.

3 Dietitian-Approved Ways to Add Nutrition to Your Diet for Sustained Energy

Nutrition plays a key role in overall health and can positively affect everything from mood to energy levels. When thinking about ways to fuel busy days that will help you feel fuller, longer, look to clean, quality protein, which isn’t just good for muscle growth and repair but also plays an integral part in overall health.

In fact, protein helps keep bones strong, supports your immune system, fuels metabolism to sustain energy, curbs cravings, distributes nutrients throughout your body and more.

If you’re looking for ways to optimize your nutrition intake, it’s important to know the U.S. Department of Health and Human Services’ Dietary Guidelines for Americans recommends the average person consume 10-35% of their daily calories from protein. Some changes like replacing cereal with protein-rich foods like eggs, snacking on healthy fats like nuts or fibrous veggies and fruits, or starting meals by eating the protein first can help set you on the right path.

In honor of National Nutrition Month, consider these bite-sized tips from nutrition expert Steph Grasso, a registered dietitian nutritionist (RDN), social media influencer and member of the Orgain Nutrition Advisory Board, to help incorporate more quality nutrition into your diet in convenient, delicious ways and keep you feeling fuller, longer:

  • Choose nutritious, filling snacks. As part of your preparation for the week ahead, meal prep refrigerated snack containers featuring nuts, sliced cheese, veggies and a fun dip, like hummus. Grab-and-go fuel is imperative to creating balanced eating habits when life gets crazy. Another convenient solution, a high-quality nutrition shake can serve as a delicious option on jam-packed days.
  • Maximize nutrition when enjoying sweets. If you have a sweet tooth, adding a scoop of high-quality protein powder to baked goods can be a simple way to sneak more protein into your diet. For example, Grasso recommends adding unsweetened Orgain Plant-based protein powder to these High-Protein Pumpkin Pancakes. With 21 grams of vegan protein and an excellent source of iron with 6 milligrams per serving, organic protein powder is non-GMO and made without added sugar and artificial sweeteners.
  • Have frozen veggies on hand. Frozen fruits and vegetables are just as nutritious and delicious as their fresh counterparts and often more affordable and convenient. They are typically picked and frozen at the peak of ripeness when they are most nutrient-dense. They are prepped and ready to go, making meal preparation fast and easy. An ideal accompaniment to your choice of protein and grain, this Frozen Veggie Side Dish includes Greek yogurt and cheese for an added protein punch.

Find more tips and protein-packed recipes at Orgain.com.

High-Protein Pumpkin Pancakes

Recipe courtesy of Steph Grasso on behalf of Orgain

  • 2 cups oats
  • 1/2 cup cottage cheese
  • 1/3 cup pumpkin
  • 2 scoops Orgain unsweetened plant-based protein powder
  • 1 teaspoon vanilla extract
  • 2 egg whites
  • nonstick cooking spray
  • berries, for topping (optional)
  • bananas, for topping (optional)
  • nut butter, for topping (optional)
  • syrup, for topping (optional)
  1. In bowl, use blender to blend oats, cottage cheese, pumpkin, protein powder, vanilla and egg whites.
  2. Spray pan over medium heat with nonstick cooking spray.
  3. Use 1/3 cup measuring cup to scoop batter into hot pan one scoop at a time.
  4. Flip pancake once pan-side is lightly browned. Remove from pan once both sides are cooked. Repeat with remaining batter.
  5. Stack pancakes and top with berries, bananas, nut butter and syrup, if desired.

Frozen Veggie Side Dish

Recipe courtesy of Steph Grasso on behalf of Orgain

  • 1/2 bag (14 ounces) frozen white pearl onions
  • 1 box (8 ounces) frozen quartered artichoke hearts
  • 1 box (10 ounces) frozen chopped spinach
  • salt, to taste
  • pepper, to taste
  • 1/2 cup frozen sweet peas
  • 1/4 cup heavy whipping cream (optional)
  • 1/4 cup 2% plain Greek yogurt
  • 1/4 cup grated Parmesan cheese
  1. Prepare frozen white pearl onions, artichoke hearts and spinach according to package instructions.
  2. In pan over medium heat, saute onions and artichoke hearts until tender. Season with salt and pepper, to taste.
  3. Add spinach, frozen sweet peas, heavy whipping cream, Greek yogurt and Parmesan cheese. Mix until cheese is melted, and peas are soft.
  4. Serve with protein and grain of choice, if desired.
SOURCE:
Orgain

A warmer planet, less nutritious plants and … fewer grasshoppers?

Higher levels of carbon dioxide are changing micronutrients in grasses, trees and even kelp. What does that mean for animals higher up the food chain?

It’s tough out there for a hungry grasshopper on the Kansas prairie. Oh, there’s plenty of grass to eat, but this century’s grass isn’t what it used to be. It’s less nutritious, deficient in minerals like iron, potassium and calcium.

Partly due to that nutrient-deficient diet, there’s been a huge decline in grasshopper numbers of late, by about one-third over two decades, according to a 2020 study. The prairie’s not hoppin’ like it used to — and a major culprit is carbon dioxide, says study author Michael Kaspari, an ecologist at the University of Oklahoma in Norman.

Atmospheric carbon dioxide is at its highest in human history. That’s probably fine for plants like the grasses the hoppers munch. They can turn that atmospheric carbon into carbohydrates and build more plant — in fact, plant biologists once thought all that extra carbon dioxide would simply mean better crop yields. But experiments in crops exposed to high carbon dioxide levels indicate that many food plants contain less of other nutrients than under carbon dioxide concentrations of the past. Several studies find that plants’ levels of nitrogen, for example, have fallen, indicating lower plant protein content. And some studies suggest that plants may also be deficient in phosphorus and other trace elements.

The idea that plants grown in today’s carbon dioxide-rich era will contain less of certain other elements — a concept Kaspari categorizes as nutrient dilution — has been well-studied in crop plants. Nutrient dilution in natural ecosystems is less-studied, but scientists have observed it happening in several places, from the woods of Europe to the kelp forests off Southern California. Now researchers like Kaspari are starting to examine the knock-on effects — to see whether herbivores that eat those plants, such as grasshoppers and grazing mammals, are affected.

The scant data already present suggest nutrient dilution could cause widespread problems. “I think we are in canary-in-a-coal mine territory,” Kaspari says.

Lower-quality food?

It’s clear that rising carbon dioxide levels change plant makeup in a variety of ways. Scientists have done years-long studies in which they pump carbon dioxide over crops to artificially raise their exposure to the gas, then test the plants for nutrient content. One large analysis found that raising carbon dioxide by about 200 parts per million boosted plant mass by about 18 percent, but often reduced levels of nitrogen, protein, zinc and iron.

Vegetables like lettuce and tomatoes may be sweeter and tastier due to added carbon-rich sugars, but lose out on some 10 percent to 20 percent of the protein, nitrate, magnesium, iron and zinc that they have in lower-carbon conditions, according to another large study. On average, plants may lose about 8 percent of their mineral content in conditions of elevated carbon dioxide. Kaspari likens the effect to trading a nourishing kale salad for a bowl of low-nutrient iceberg lettuce.

Scientists don’t yet know exactly how extra carbon dioxide leads to changes in all these other nutrients. Kaspari, who discussed the importance of micronutrients such as calcium and iron in ecosystems in the 2021 Annual Review of Ecology, Evolution and Systematics, suggests it’s a simple issue of ratios: Carbon goes up but everything else stays the same.

Lewis Ziska, a plant physiologist at the Columbia University Mailman School of Public Health in New York City, thinks it’s more complicated than just ratios. For example, in the vegetable study, elevated carbon dioxide increased the concentration of certain nutrients, such as calcium, even as it limited levels of others.

One contributing factor could be plants’ little openings, called stomata, through which they take up the carbon dioxide they use to make sugars and the rest of their structures. If there’s plenty of carbon dioxide around, they don’t need to open the stomata as often, or for as long. That means plants lose less moisture via evaporation from those openings. The result could be less liquid moving up the stem from the roots, and since that liquid carries elements such as metals from soil, less of those trace elements would reach the stems and leaves.

Scientists have also posited that when carbon dioxide is high, plants are less efficient at taking up minerals and other elements because the root molecules that normally pull in these elements are acting at a lower capacity. There are probably multiple processes at play, says Ziska. “It’s not a one-size-fits-all mechanism.”

Whatever is going on in these well-studied crops, the same thing is presumably occurring in trees and weeds and other non-agricultural species, says Kaspari. “If it’s happening to the human food supply, it’s happening to everybody else.”

Several studies suggest that Kaspari is right. For example, even though farmers add nitrogen fertilizer to croplands and that nitrogen then washes into neighboring waterways or wildlands, nitrogen availability is on the decline in a variety of non-agricultural ecosystems. In one analysis, researchers examined nitrogen levels in more than 43,000 leaf samples, collected in various studies between 1980 and 2017. Atmospheric carbon dioxide levels rose by nearly 20 percent during that period, and nitrogen concentrations in the leaves decreased by 9 percent. Mineral concentrations are also affected: Scientists who studied trees in Europe between 1992 and 2009 observed a drop in several, including calcium, magnesium and potassium, in at least some of their leaf samples.

Scientists can also examine museum and herbaria samples to study how plant nutrient content has changed as planetary carbon dioxide levels have risen. Ziska and colleagues did so for goldenrod, a key food source for bees. Using collections from the Smithsonian Institution’s natural history museum in Washington, DC, they analyzed pollen from as far back as 1842, just before the American Industrial Revolution. At that time, the carbon dioxide levels were 280 parts per million, compared to just over 420 today.

Pollen protein content, and thus nutrition level, decreased over time by about one-third, the scientists found. Ziska’s modern experiments with goldenrod grown under carbon dioxide levels as high as 500 parts per million confirmed that more carbon dioxide yields protein-deficient pollen. Though it’s not clear yet what this means for bees, it’s probably not good, Ziska says.

The results are striking, particularly compared with crop studies that don’t draw on large historical datasets, says Samuel Myers, a principal research scientist at the Harvard T.H. Chan School of Public Health who has investigated the link between the health of pollinators and human nutrition.

Lush grasslands, empty calories

Animals such as bees need more than protein from their diet; they also need micronutrients. Certain minerals, like sodium, are more important for animals than for plants, Kaspari notes. Many plants are fine with no sodium at all, but animals require sodium for brains and muscles to work properly. (That’s why deer visit salt licks and athletes chug Gatorade.) Many plants seem to survive without iodine, but animals depend on it for thyroid function.

Nutrient dilution, then, could affect herbivores in all kinds of ways, and could be contributing to a reported, though controversial, drop in insect numbers that’s sometimes referred to as the “insect apocalypse,” says Andrew Elmore, an ecologist at the University of Maryland Center for Environmental Science in Frostburg. “When insects are nutritionally stressed, they don’t grow as quickly, and therefore they don’t reach maturity as quickly, they don’t reproduce as rapidly, and so population size can decline,” Elmore says.

Kaspari’s study on Kansas grasshoppers, published in 2020, was the first to link nutrient dilution in plants to a conspicuous decline in an insect population. It focused on the Konza Prairie, a natural area in northeastern Kansas that’s been set aside to research the tallgrass prairie ecosystem. Konza features shrubs and trees alongside grasses, and is home to rodents, birds, lizards and deer.

Kaspari and colleagues accessed more than three decades’ worth of data on the prairie’s plant life and grasshopper populations — more than 93,000 of the insects had been sampled. Plant biomass went up, mostly due to a doubling of grass biomass, from the mid-1980s through 2016. That sounds like a big buffet for grasshoppers, but their populations declined by more than 2 percent every year, the researchers found. Kaspari and colleagues think the reason lies in the grasses: Within them, several elements that grasshoppers need — nitrogen, phosphorus, potassium and sodium — waned over the same time period.

While other aspects of climate and weather no doubt played a role in grasshopper numbers, the researchers estimated that nutrient dilution was responsible for about one-quarter of the grasshopper decline.

There are hints that creatures higher up the food chain — grasshopper predators — might be affected too. Alice Boyle, an avian ecologist at Kansas State University in Manhattan, says that her as-yet-unpublished data from the Konza Prairie show that when researchers counted territorial male grasshopper sparrows in specific areas over time, the birds’ population dropped from about 65 in 1980 to fewer than 20 in 2021. The species could disappear from the prairie within 100 years, she says.

Grasshoppers are major chompers of grass in grasslands like Konza, but so are bigger animals that graze the prairie. Little is known about the effects of nutrient dilution on large herbivores such as deer, but for evidence of what might be going on, Kaspari points to their “urban cousins” — cattle.

To investigate possible nutrient dilution in cattle diets, Elmore and colleagues took advantage of a long-term dataset on cow dung from Texas A&M Agrilife Research in Temple. There, rangeland ecologist Jay Angerer, now with the US Department of Agriculture, helped ranchers concerned about their animals’ nutrition by analyzing cow patties — a practice that has given him more than 36,000 measurements covering more than 22 years. The researchers found that since 1994, when carbon dioxide levels were about 360 parts per million, the concentration of crude protein in the cowpat samples dropped by almost 10 percent.

These studies paint a picture of American grasslands that have become green deserts, stacked with lush plant life that offers empty calories. How the interwoven effects of high carbon dioxide, plants, and the animals that eat the plants will play out in other ecosystems remains to be seen. Studies aiming to clarify what’s going on are underway: For example, a large collaboration called the Nutrient Network is busy analyzing grassland nutrient budgets and herbivore populations around the world, in order to better understand the links between plant production and diversity and the influence of grazers. And the Cedar Creek Ecosystem Science Reserve, at the University of Minnesota, has been analyzing how ecosystems are responding to environmental change, including high carbon dioxide, for more than four decades.

The diverse effects of climate change on natural ecosystems make it hard to know how concerned to be. Some organisms could gain an advantage while others lose out. For example, the grasshoppers Kaspari studied appear to be taking a hit, yet other grasshoppers — specifically, crop-damaging locusts — seem to benefit from a diet that’s less nutrient-rich.

“That’s what keeps me up at night, is the complexity of the global experiment that we’re now running on the ecosystem,” says Myers, who is director of the Planetary Health Alliance, a consortium investigating the impacts of environmental degradation on human health. “We don’t have any idea what the implications are.”

This article originally appeared in Knowable Magazine, an independent journalistic endeavor from Annual Reviews.

4 Tips to Plan a Bountiful Garden

Whether you’re a novice just learning to cultivate a magical display or an avid gardener with years of experience, early planning can help bring this year’s garden to life.

These simple tips can help you start planning, and before you know it, you can start putting your plans into action.

Assess your environment. Determine what factors may aid or hinder your garden’s success. What do you know about the soil? Lighting? Exposure to threats such as hungry or curious wildlife? Uncovering potential roadblocks early can help you identify potential solutions or alternatives that may help you bypass issues altogether.

Create a mental image. Look through seed catalogs, magazines and books, and browse the internet for inspiration. Vibrant colors and textures are the hallmarks of a beautiful spring garden, but spend time learning exactly what appeals to you most. Take notes, particularly as you identify new species you may want to introduce. You’ll need to do additional research to ensure their growing requirements are consistent with your environment.

Put it to paper. Transferring your vision to paper can help you plan appropriately and ensure you’re not overfilling or leaving unsightly gaps in your garden. Understanding where each plant will go and how much each needs to flourish before you turn a spade of soil can help make planting a breeze. Remember it is easier to change your mind with a pen and paper in hand than with fragile vegetation.

Create a calendar. Timing is critical to maximizing the time you are able to enjoy your garden. Understand the growing season for each plant and map it all out on a calendar so you can stagger when new varieties emerge and keep your garden active and thriving. Be sure to give yourself some wiggle room for unforeseen circumstances, such as weather, that may prevent you from planting exactly as you’ve planned.

For more tips to safely begin planting, visit eLivingtoday.com.



Rana Plaza: ten years after the Bangladesh factory collapse, we are no closer to fixing modern slavery

It’s ten years since the tragic collapse of the Rana Plaza building near Dhaka, Bangladesh, which killed at least 1,132 garment workers and injured several thousand more. The collapse of the eight-storey building on April 24 2013, which housed five factories making clothes for western high street brands like Accessorize, Primark and Walmart, was the worst of its kind in the world.

The owner, Mohammed Sohel Rana, had allegedly been told by an engineer the day before that the building was not safe and should be evacuated. Ten years on, the murder trial against him and another 35 defendants has still not been concluded.

The tragedy shed a light on the appalling conditions that sometimes exist in the global retail supply chain. Wealthy countries have unveiled lots of initiatives in the ensuing years to make things better. Unfortunately, the situation has not improved. So where are we going wrong?

The response to Rana

Immediately after the tragedy, various global initiatives were launched to ensure the safety of garment workers in the country, such as the Accord on Fire and Building Safety and Alliance for Bangladesh Worker Safety. These focused on things like increasing building fire and safety audits and inspections, with some success in factory safety for workers.

There have also been moves to curb exploitation and forced labour. Forced labour, which is often referred to as modern slavery, includes situations where workers are not in a position to give informed consent to their conditions, and where they will be penalised if they refuse. Without getting into the fine detail of exactly where this applies, it arguably includes Rana Plaza.

Rack of jeans in a shop window
Retailers now have to disclose how they are tackling modern slavery in their supply chains. I Wei Wang

Many wealthier jurisdictions including the UK, France, Germany, the EU and Australia have enacted legislation to tackle forced labour. This requires companies within those countries to produce things like annual modern slavery statements or due diligence reports to show they are managing their supply chains properly and ensuring workers are treated fairly.

Much of this legislation is disappointing. The UK Modern Slavery Act 2015 only applies to companies with upwards of £36 million annual turnover. Companies have to disclose what steps they are taking to deal with slavery risks in their supply chains, but don’t have to specify which abuses have taken place. There is also no penalty for failing to make the necessary disclosures.

On the other hand, Germany has made it mandatory for companies to enforce standards within their supply chains to make sure their suppliers are ethical employers and providing safe working conditions, as opposed to the UK approach of simply requiring a disclosure. Germany also imposes fines of up to €8 million (£7 million) or 2% of annual turnover, whichever is higher. It only applies to companies with turnover in excess of €400 million, however. There are also proposals for a mandatory due diligence directive across the EU, though it’s not yet clear whether this will go ahead.

Our findings

Numerous studies have shown that – despite all the social audits, ethical codes, corporate social responsibility disclosures and moral narratives global fashion retailers use – workers’ human rights have not improved. Indeed, the situation was aggravated by COVID 19.

When some colleagues and I interviewed Bangladeshi garment workers and people in trade unions and NGOs, we found that the pandemic had led to job losses and increased people’s financial burdens. This made it harder for women workers to support themselves and their families.

In December 2021 we then surveyed 1,000 garment factories and found that more than half during the pandemic had endured retailers suddenly cancelling orders, delaying payments, reducing what they were willing to pay or refusing to pay for completed goods. Retailers on the list included (but were not limited to) Aldi, Asda, Asos, Bestseller, Costco, H&M, Kik, Lidl, New Look, Nike, Next, Pep&Co, Primark and Zara.

Yet no suppliers took customers to court for cancellations or refusing to pay for goods. Three-quarters of factories were still selling to brands at the same prices as in March 2020. Nearly one in five factories also struggled to pay the Bangladeshi minimum wage.

The situation today

Since the pandemic, suppliers continue to struggle amid high inflation. In Bangladesh, unions are demanding that the legal minimum wage for garment workers be almost tripled, but so far with no success. Garment exports have increased more than 35% since the start of the pandemic yet wages and employee numbers have stayed the same.

The collapse of British online retailer Misguided in 2022 gave more insight into the unfairness of the supply chain when it was revealed that clothing producers in Pakistan were shipping consignments and not getting paid until later. When Misguided went under, this meant not getting paid at all, leading to hundreds of workers being made redundant.

Meanwhile, International Labour Organization-led estimates suggest that the number of people in forced labour around the world rose from 24.9 million to 27.6 million between 2016 and 2021. Many workers in poor conditions in the retail supply chain would not be categorised as forced labour, but this rise is certainly not encouraging. Overall, these are various signs during and since the pandemic that suggest the modern slavery legislation is not having the desired effect.

So what can be done? Instead of more transparency regulations, we need a watchdog to investigate unfair practices around the world and punish companies that are found guilty. As well as investigating forced labour allegations, it would penalise companies for doing cut-price deals that prevent workers from receiving a living wage. It would also prevent companies from delaying payments for long periods or refusing to pay for completed goods.

A bill was tabled in the UK parliament to establish such an adjudicator last July. It has been publicly supported by more than 50 MPs and is expected to be put back before the House of Commons in the near future. For the longer term, to harmonise practices between different countries, it would also make sense to establish an international fashion watchdog.

It is unavoidable that COVID and high inflation have adversely affected supply chain workers, and no one is denying that exploitation by suppliers is part of the problem. But an international watchdog that puts more pressure on retailers to treat their supply chains fairly is an essential part of the puzzle. Until a regime is in place with genuine teeth to ensure retailers toe the line, the modern slavery behind high-street fashions will only continue.

Muhammad Azizul Islam, Chair in Accountancy and Professor in Sustainability Accounting and Transparency, University of Aberdeen

This article is republished from The Conversation under a Creative Commons license. 

What a second-century Roman citizen, Lucian, can teach us about diversity and acceptance

Lucian of Samosata, a high-ranking Roman official. Michael Nicholson/Corbis via Getty Images
Eleni Bozia, University of Florida

People who don’t fit the dominant demographic of where they live can often be asked, “Where are you really from?”

In 2017, CNN surveyed about 2,000 people who shared their stories on social media with the hashtag #whereiamreallyfrom. The participants included first- and second-generation immigrants, naturalized individuals and others who were native-born citizens.

As a classical studies scholar with a focus on linguistic and cultural diversity in Imperial Greek and Latin literature, I am aware that this question is not a new one.

Take Lucian, a high-ranking Roman official in the second century. Born in Syria, he later chose to be a naturalized Roman. As a non-native speaker of Greek and Latin who, by his own admission, looked different from many people in Greece and Rome, he dealt with issues of ethnicity, language use and social acceptance.

The Roman world

The time of the Roman Empire is a unique historical period that, in many respects, can be seen as a lived lesson for issues of diversity and inclusion. By Lucian’s time, the Romans had conquered Spain, France, parts of Germany and Britain, Greece, the North Africa coast and much of the Middle East, among other territories.

As occupiers, they did impose their rule with military means. Still, they accepted their subjects’ differences, granted privileges to several provinces and gave citizenship on a case-by-case basis until A.D. 212, when everyone was given Roman citizenship.

Their pragmatic aim was to maintain stability and ensure cooperation. The result was a multilingual, multicultural and cosmopolitan empire. People were allowed to retain their ethnicity, language, culture and religion for the most part. Latin was [not imposed except in the army] and administration; Greek was established as the language of the educated.

This period could be said to resemble our current times: People traveled, relocated and worked in different parts of the empire. Also, there were scholars and writers who were trilingual and multicultural. For instance, there were African authors who wrote in Latin and were also fluent in Greek, and Romans who were fluent in Greek, too.

Page of an old manuscript with writing in Latin.
Title page of a 1619 Latin translation of Lucian’s complete works. Private collection via Wikimedia Commons

These authors wrote about their sense of identity and belonging and were proud of their ability to remain true to their origins while also adapting to the conditions of the global world of the empire. On the other hand, there were also other authors who were anti-immigration and critical of new citizens and non-native speakers, and others who showed that Roman occupation weighed heavily on their subjects.

So, where was Lucian really from?

Lucian is a cosmopolitan individual. He was born in Samosata, which was in Syria until it was incorporated into the Roman Empire. He traveled to Cappadocia, Pontus, Athens, Rome, Gaul and Egypt. He wrote in perfect Greek; he was in the entourage of the Roman Emperor Lucius Verus and served as the secretariat of the Roman prefect in Egypt.

Throughout all his works, Lucian clearly suggests that he should be accepted in this new world as the model of the new citizens – individuals who were open about their ethnic identity yet embraced the Greco-Roman culture and contributed to advancing contemporary social inclusion.

In his essay “The Dream,” Lucian imagines his future as an underrepresented citizen. He writes that two women appeared in his sleep: an elegant one representing Greek education and a rugged one representing a craftsman’s life. The former promised him a life of popularity among the world’s elite. He chooses to be a well-to-do man of letters who overcame his humble origins and succeeded in a cosmopolitan society, even though he was not a native speaker or a native citizen.

In another one of his writings, “Zeuxis,” he writes about about his fluency in Greek and insists that he should not be seen as an outsider because he is as articulate as any native-born Greek speaker.

He becomes more emboldened in his treatise “A Slip of the Tongue in Greeting.” Here, he intentionally makes a mistake in a salutation and supposedly writes to apologize. In reality, however, he shows his knowledge of Greek cultural norms and, at the same time, clearly proves that he is versed in Roman culture, too.

On the other hand, he also wrote a piece titled “My Native Land,” in which he says that no matter the languages one learns, the cultures one acculturates oneself to, and the global recognition, they are always their motherland’s sons and daughters – proud of them and indebted to them.

Lucian’s work provides a unique insight into a world of imperialism that also fostered multilingualism and multiculturalism and gave birth to the first global citizens. His writings show what diversity and inclusion can look like through the eyes of the empire’s newest citizens – and offers illuminating lessons from an often forgotten classical past.

Eleni Bozia, Associate Professor of Classics and Digital Humanities, University of Florida

This article is republished from The Conversation under a Creative Commons license. 

Sunday, April 23, 2023

Hi, robot: Why robotics and language need each other

Machines might better understand our commands if they experienced our physical worlds, researchers say. That enhanced perception could sharpen their listening skills and improve performance.

When Stefanie Tellex was 10 or 12, around 1990, she learned to program. Her great-aunt had given her instructional books and she would type code into her father’s desktop computer. One program she typed in was a famous artificial intelligence program called ELIZA, which aped a psychotherapist. Tellex would tap out questions, and ELIZA would respond with formulaic text answers. “I was just fascinated with the idea that a computer could talk to you,” Tellex says, “that a computer could be alive, like a person is alive.” Even ELIZA’s rote answers gave her a glimmer of what might be possible.

In college, Tellex worked on computational linguistics. For one project, she wrote an algorithm that answered questions about a block of text, replying to a question such as “Who shot Lincoln?” with “John Wilkes Booth.” But “I got really disillusioned with it,” Tellex says. “It basically boiled down to counting up how many words appeared with other words, and then trying to produce an answer based on statistics. It just felt like something was fundamentally missing in terms of what language is.”

For her PhD, Tellex worked with Deb Roy at the MIT Media Lab, who shared her disillusionment. He told her: “Yeah, what’s missing is perception and action. You have to be connected to the world,” Tellex says. Language is about something — an object, an event, an intent, all of which we learn through experience and interaction. So to master language, Roy was saying, computers might need such experience, too. “And that felt really right to me,” she says. “Plus, robots are awesome. So I basically became a roboticist.”

Tellex, who is now at Brown University, combines both her interests in “Robots That Use Language,” a survey that she and three colleagues published in the 2020 Annual Review of Control, Robotics, and Autonomous Systems. From a practical standpoint, language offers an intuitive way for users to guide machines in a host of applications, including home care, factories, surgical suites, search and rescue, construction, tutoring and autonomous vehicles.

“Language is the right interface when you have untrained users, under high cognitive load, interacting with a system that’s really complicated,” Tellex says. That’s especially true in situations such as elder care, adds coauthor Cynthia Matuszek, a roboticist at the University of Maryland, Baltimore County. Imagine an 80-year-old asking her home-care robot to cook something new for lunch: “I’m tired of tomato soup; make me a sandwich.” Well, Matuszek says, “if it’s like, ‘Okay, I’m gonna have to call a team of programmers for that,’ that’s not a useful robot.”

At the same time, however, Tellex and her coauthors emphasize that a robot’s ability to follow natural-language commands — “words to world,” we might call it — can reinforce its ability to understand those commands: world to words. Experience with sitting, for example — the kind of experience a disembodied Siri or Alexa doesn’t have — might help a robot identify and fetch a chair or some suitable alternative when it’s asked for one.

Being physically embedded in the world could also help robots deal with the fact that much of our language (and perhaps even our thought) is metaphorical. Understanding that a “big idea” really means “an important notion,” for example, may be enhanced by experience with physical size.

Real-world experience could even help robots deal with the notorious ambiguity of natural language, as well as its reliance on lots of background knowledge about the world and its assumption that the listener can infer a speaker’s intent. “I’m hungry” might really mean “Make me a sandwich,” which in turn requires an understanding of sandwiches — what they’re for and how to make one. Bodies might give computers common sense, or at least a better semblance, addressing one critique of large language models made in “On the Dangers of Stochastic Parrots,” an under-review paper that has been linked to the computer scientist Timnit Gebru’s recent dramatic departure from Google: Such word-counting algorithms sound coherent while lacking comprehension.

In short, Matuszek says, combining robotics and language complicates both, but they have the potential to bolster each other.

In practice, of course, learning language isn’t nearly as easy as it looks, real-world experience or not. But in the past decade or so, there has been increased progress in the robots-and-language realm. This is thanks to the development of “deep-learning” systems that operate in a way reminiscent of the brain, and that can map rich patterns of speech and text to rich patterns of perception and action. “I think we’ll see it in our lifetimes,” Matuszek says. “If you’re like, ‘Get the thus and such,’ that will be pretty near term. ‘Get me my favorite mug and serve dinner’ — harder, right? It’s a field, and fields make progress in fits and starts.”

From here to there

When might you want to speak to a robot? One likely situation would be when you tell it to go somewhere to do something for you, like fetch you a drink from the kitchen. So researchers have thought hard about combining language with navigation.

One well-studied task of this type is Room-to-Room (R2R), introduced in 2018. A database contains dozens of virtual building interiors with photo-realistic graphics, a set of pathways through the rooms and human-generated descriptions of those trajectories. Virtual environments like this are common in robotics research. The aim is to develop algorithms that work in simulation — where tasks can be completed faster than in real life, and expensive robots don’t experience wear and tear — and then transfer them to the real world. In the R2R case, the task is for a virtual robot to follow directions such as, “Head upstairs and walk past the piano through an archway directly in front. Turn right when the hallway ends at pictures and table. Wait by the moose antlers hanging on the wall.”

The paper that introduced the R2R task also presented a simple machine-learning algorithm to tackle it. Implementing a “sequence-to-sequence” architecture, this system takes in a sequence of words and outputs a sequence of action commands, rather like translating from one language to another. In between is a neural network, an arrangement of simple computing elements roughly mimicking the brain’s wiring. The network has sub-networks specialized for handling language (the instructions) and images (what the virtual robot sees). When it succeeds during training, the active neural connections increase in strength.

After training, the sequence-to-sequence model in the paper succeeded about 20 percent of the time. But since then, other researchers working on R2R have refined the methods and achieved success rates of over 70 percent. One system even accelerates its learning by attempting auxiliary tasks like explaining its actions (“I step in the door and go forward”) or estimating its progress (“I have completed 50 percent”).

Some researchers also work on navigation with physical robots. At a conference this year, for example, Cornell University computer scientist Yoav Artzi and his colleagues reported success at translating from natural-language instructions to navigation in a physical quadcopter. The quadcopter flew over an area (about five meters square) scattered with various objects. Its control software learned, with a combination of simulated and real data, to follow directions like this one: “After the blue bale take a right towards the small white bush, before the white bush take a right and head towards the right side of the banana.” It received top marks from human judges about 40 percent of the time. That’s well above the 15 percent success rate of a system that just takes average actions, but leaves plenty of room for progress, indicating the difficulty of the task.

Now what?

We want to be able to tell robots not only to navigate to places, but also to do things once they get there. Your sandwich-fetching robot needs to understand not only “Go to the kitchen,” but also “Make a ham-on-rye.” Or at least to answer questions about what it sees when it gets there, such as “Are we out of bread?” In 2018, researchers at Georgia Tech and Facebook created a task (and a dataset) called embodied question answering (EQA). A virtual robot navigates virtual homes, answering questions like “What color is the car?” It must reason that the car is in the garage, go there, look at it and answer, using an algorithm that combines components for vision, question processing, navigation and answer producing.

Working with the same virtual environment, other researchers followed up with a harder task, the multi-target EQA, in which the virtual robot must answer questions like “Does the dressing table in the bedroom have the same color as the sink in the bathroom?” It was about 60 percent accurate.

Recently, researchers published a virtual robot manipulation task called ALFRED, consisting of many domestic scenes filled with objects. Commands include things like “Put a hot potato slice on the counter,” which requires figuring out that it needs to heat a potato, slice it and place the slice on the counter. Their neural network was successful less than 1 percent of the time. To do better, the researchers may need to supplement the deep-learning neural network with systems of handwritten rules — an older approach that’s often called good old-fashioned AI (GOFAI). Some researchers, in fact, argue that we will need hybrid GOFAI–deep-learning systems for the foreseeable future.

Perhaps the biggest single limitation of deep learning is its reliance on big data. Children can sometimes learn from one example, whereas artificial neural networks can require training on thousands or millions. Google has sought a way to reduce deep learning’s need for data, with an algorithm called “language-conditioned learning from play.” A person controls a multi-jointed robot arm in a virtual space called 3D Playroom, containing a desk with a door, a drawer, three buttons, a block and a trash bin. The person just plays around, and the computer learns in part by imitating the humans.

One of Tellex’s favorite projects was a forklift she worked on as a postdoc at MIT that used GOFAI to follow commands like “Put the pallet of pipes on the truck.” “What I loved about that project,” she says, “was that it was a real application where there was a robot that was doing real stuff in the environment.”

Tell me more

We want robots to do more than follow instructions. We want to converse and collaborate with them. That’s not always easy, says Jesse Thomason, a computer scientist who next year will join the University of Southern California. What people actually say is often highly ambiguous, if not outright gibberish. “We can point to another person,” he says, “and be like, ‘Hey, can you help me with that thing I said earlier?’ And they will understand exactly what that means.” Frequently, people don’t even speak in complete sentences or with perfect grammar.

To tackle that problem, Thomason and collaborators trained a virtual robot to ask questions in response to instructions, simultaneously improving its ability to parse sentences and perceive the world. They then implanted that intelligence in a physical robot, an arm on a Segway that roamed around a set of offices. In one instance, a person told the robot, “Move a rattling container from the lounge by the conference room to Bob’s office.” It didn’t know what “rattling” meant, so it asked for a few examples of things that do and don’t rattle. The person shook a pill jar, a container of beans and a water bottle. The robot then went and found the item, delivering it successfully.

Baby talk, baby steps

“Overall, natural language control of robotic agents is largely an open problem,” Artzi says. “I can’t say there are impressive working examples. Maybe impressive from a research standpoint, but far from reaching the vision we have in mind.”

Still, datasets and algorithms and computation are all improving. Plus, Thomason notes, simulated environments for experimentation are becoming more realistic. And at the same time autonomous robots are getting cheaper and widening their commercial presence through companies like Skydio (aerial drones) and Waymo (self-driving cars). We’ve come a long way from the forklift Tellex labored on a decade ago. As she says, “I see the frontiers for language and robots opening up.”

This article originally appeared in Knowable Magazine, an independent journalistic endeavor from Annual Reviews.