March 2022

Wondering is a series of random questions answered by Harvard experts. For the latest installment, we asked the Kennedy School psychologist Jennifer Lerner to explain friend envy — where it comes from, why it’s so powerful, how we can avoid it. The question was inspired by a famous Gore Vidal quip: “Whenever a friend succeeds, a little something in me dies.”

 

Envy is a timeless emotion. Long before Gore Vidal, Aristotle said: We envy those whose acquisitions and successful efforts are a reproach to us. The Vidal quote makes clear how envy robs potential moments of joy. Envy can eat you alive. It’s characterized in the scientific literature as a strongly unpleasant state of inferiority, hostility, and resentment, which is why it sometimes triggers its cousin emotion schadenfreude — taking delight in another’s downfall. Outside of New England, there are millions of football fans who are both envious of the Patriots’ trophies and delighted when they lose. While brief moments of schadenfreude can be relatively harmless, envy tends to endure, sometimes to the point of obsession.

Fortunately, envy is not inevitable. One way to avoid it involves appreciating the collective good. For example, a writer whose friend wins a literary prize could focus on the fact that any advance in literature is ultimately an advance for all of us. After all, we all get to read the book! Relatedly, the thriving field of negotiation research has demonstrated that if you avoid assuming a “fixed pie mindset” — i.e., believing there’s a predefined set of goods in the world, and any good for the other person is less good for me — you have a better chance of finding integrative solutions to conflict that create more value overall.

Hundreds of studies find that human beings routinely make social comparisons, intentionally or unintentionally. Nowadays, social media magnifies opportunities for making such comparisons. In the Harvard community, where someone wins an international award nearly every day, it might be easy to become envious if you constantly compare yourself to the superstar down the hall. Instead, we can consciously choose to compare our present self to our past self.

As a motivation device, and one that short-circuits envy as a byproduct, I make it a habit to recall my past circumstances and compare them to my present. As a sophomore in high school, I was diagnosed with a lifelong, sometimes severe chronic disease, systemic lupus erythematosus. There have been many days, weeks, and months where my focus had to be on simply getting out of bed or getting out of the hospital. When I think about such times, doing what we social psychologists call “downward social comparison to my prior self,” I’m typically filled with gratitude that I can work at all. I find this is much more conducive to happiness and productivity than if I compared myself to someone else. Anyone can choose to compare their present circumstances to their past circumstances (rather than to others’ circumstances). We’ve all overcome tough times, especially during the pandemic. Actively pausing to reflect on resiliently living through such times is perhaps the best kind of social comparison our comparison-prone minds can make. “Whenever a friend succeeds, a little something in me smiles” — knowing that they’ve overcome something, too.



How can anthropologists take the paranormal seriously? It’s a question Jack Hunter has explored for years and one he addressed in a virtual Harvard talk on Tuesday.

The Welsh author and anthropologist, who studies consciousness, religion, ecology, and the paranormal, discussed his academic work and his own supernatural experiences with Giovanna Parmigiani, a lecturer on religion and cultural anthropology at the Divinity School and a scholar of contemporary paganisms. The conversation was sponsored by the Transcendence and Transformation initiative of the Center for the Study of World Religion.

Researchers who study the paranormal have long been eager to bring their work out of the domain of mysticism and religion and into the domain of the natural, said Hunter. By using the term “supernormal,” he said, early investigators were acknowledging that while the topic may not be typical, “it’s a normal part of the processes that go on in the world.”

Hunter’s own interest in the supernatural developed early on. Though raised to be a religious skeptic, he was always interested in miracles, saints, and relics, he said, and later had “some extraordinary experiences of my own.”

As a college student he became intrigued with what happens when you “treat these experiences seriously.” He found his answer while researching the Bristol Spirit Lodge, a center in Bristol, England, for the development of mediumship. During his first séance, he saw “this green mask appear over the face of the medium, and kind of slide down and just sort of dissipate.” Convinced he was hallucinating, Hunter said nothing. Later he was shocked when someone else mentioned the same green mask.

In a separate séance, he felt his hand “being pushed up by a balloon of air.”

“My left hand started to literally move around; it was almost as if it was waving. And I was in a strange state of mind, where I realized that, you know, I’m not consciously willing this to move — I don’t know what it means. It really freaked me out.”

What Hunter calls his “hand-possession experience,” convinced him that there is, at the very least, “an experiential origin to the belief in mediumship.”

“If you take that experience seriously in itself,” he added “then you have to take the other implications that go along with that as well, which may be that our standard models are limited, or they don’t cover everything that happens in the world.”

Hunter addressed the question of fakery among mediums, acknowledging the performative element of the practice. But being able to detect trickery in a séance, he said, “doesn’t mean that everything else is fake.”

On the question of how to study the paranormal anthropologically, Hunter said that his field has an advantage over others thanks to its emphasis on context.

“That’s what we need to understand these kinds of complex experiences,” he said. “The moment that we start to try to break them down and put them into a laboratory condition, remove them from the emotional, lived-world experience that they take place in naturally, then we’re kind of steering ourselves away from understanding them.”

Anthropologists, he added, engage with phenomena in ways sociologists or psychologists might avoid. “We’re encouraged to actually participate in rituals,” he said, “in order to understand them.”



It looks like fireflies flickering in the darkness. Slowly, more and more amass, lighting up the screen in large chunks and clusters.

But this is not a video about insects. It’s a simulation of the early universe, a time after the Big Bang when the cosmos transformed from a place of utter darkness to a radiant, light-filled environment.

The stunning video is part of a large suite of simulations described in a series of three papers accepted to the Monthly Notices of the Royal Astronomical Society. Created by researchers at the Center for Astrophysics | Harvard & Smithsonian, Massachusetts Institute of Technology, and the Max Planck Institute for Astrophysics, the simulations represent a monumental advancement in simulating the formation of the first galaxies and reionization — the process by which neutral hydrogen atoms in space were transformed into positively charged, or ionized, hydrogen, allowing light to spread throughout the universe.

The simulated period, known as the epoch of reionization, took place some 13 billion years ago and was challenging to reconstruct, as it involves immensely complicated, chaotic interactions, including those between gravity, gas and radiation, or light.

“Most astronomers don’t have labs to conduct experiments in. The scales of space and time are too large, so the only way we can do experiments is on computers,” explains Rahul Kannan, an astrophysicist at the Center for Astrophysics and the lead author of the first paper in the series. “We are able to take basic physics equations and governing theoretical models to simulate what happened in the early universe.”

A simulation showing the early universe from about 250 to 1,050 million years after the Big Bang. The initial flickering is bursts of radiation, or light, from the first low-mass galaxies. Light begins to permeate throughout the universe as more and more hydrogen atoms become ionized.

Credit: Thesan Collaboration

The team’s simulations — named Thesan after the Etruscan goddess of dawn — resolve interactions in the early universe with the highest detail and over the largest volume of any previous simulation. Physics in the early universe are captured down to scales that are a million times smaller than the simulated regions, providing unprecedented detail on properties of early galaxies and how light from these galaxies impacted gas.

The team accomplishes this by combining a realistic model of galaxy formation with a new algorithm that tracks how light interacts with gas, along with a model for cosmic dust.

With Thesan, researchers can simulate a piece of our universe spanning over 300 million light-years across. The team can run the simulation forward in time to track and visualize the first appearance and evolution of hundreds of thousands of galaxies within this space, beginning around 400,000 years after the Big Bang, and through the first billion years.

The simulations reveal a gradual change in the universe from complete darkness to light.

“It’s a bit like water in ice cube trays; when you put it in the freezer, it does take time, but after a while it starts to freeze on the edges and then slowly creeps in,” says study co-author Aaron Smith, a NASA Einstein Fellow in MIT’s Kavli Institute for Astrophysics and Space Research. “This was the same situation in the early universe — it was a neutral, dark cosmos that became bright and ionized as light began to emerge from the first galaxies.”

The simulations were created to prepare for observations from the James Webb Space Telescope (JWST), which will be able to peer further back in time —approximately 13.5 billion years — than predecessors like the Hubble Space Telescope.

“A lot of telescopes coming online, like the JWST, are specifically designed to study this epoch,” Kannan says. “That’s where our simulations come in; they are going to help us interpret real observations of this period and understand what we’re seeing.”

Real telescope observations and data will soon be compared to Thesan simulations, the team explains.

“And that’s the interesting part,” says study co-author Mark Vogelsberger, an associate professor of physics at MIT. “Either our Thesan simulations and model will agree with what JWST finds, which would confirm our picture of the universe, or there will be a significant disagreement showing that our understanding of the early universe is wrong.”

The team, however, won’t know how various aspects of their model fares until the first observations roll in, which will cover a wide range of topics, including galaxy properties and the absorption and escape of light in the early universe.

“We have developed simulations based on what we know,” Kannan says. “But while the scientific community has learned a lot in recent years, there is still quite a bit of uncertainty, especially in these early times when the universe was very young.”

The simulations were created using one of the world’s largest supercomputers, the SuperMUC-NG, over the course of 30 million CPU-hours. The same simulations would have required more than 3,500 years to complete on a normal computer.

Additional scientists who make up the Thesan team are Lars Hernquist of the CfA; and Enrico Garaldi, Ruediger Pakmor and Volker Springel of the Max Planck Institute for Astrophysics.



Throughout human history, most of our efforts to store information, from knots and oracle bones to bamboo markings and the written word, boil down to two techniques: using characters or shapes to represent information. Today, huge amounts of information are stored on silicon wafers with zeros and ones, but a new material at the border of quantum chemistry and quantum physics could enable vast improvements in storage.

Suyang Xu, assistant professor of chemical biology, is tying quantum mechanical “knots” in topological materials, which may be the key to unlocking the potential of quantum technologies to store and process vast arrays of information and bring game-changing advances in a variety of fields.

“Imagine a rope identified by a number of knots,” Xu said. “No matter how much the shape of the rope is changed, the number of knots — known as the topological number — cannot be changed without altering its fundamental identity by adding or undoing knots.” It is this robustness that potentially makes topological materials particularly useful.

Xu, who took his undergraduate degree in China, first encountered topological materials when he started graduate school in physics at Princeton in 2008 when the materials were first being created. Xu’s research interests involve electronic and optical properties in quantum matters, such as topological and broken symmetry states.

Topological materials move electrons along their surfaces and edges without any friction or loss, making them promising materials for super-high-speed electronics, like quantum computers. Such devices have the potential to be more powerful than existing computers because their quantum bits, referred to as “qubits,” take advantage of two properties of quantum states —superposition and entanglement — to encode information.

However, quantum states are delicate and when they are perturbed can lead to decoherence, falling out of sync and losing stored information. Because topological materials are robust and resist perturbation, they could be used to build more resilient and longer-lasting qubits.

The basics of quantum physics, as explained by students and faculty across Harvard.

Video by Kai-Jae Wang/Harvard staff

Xu’s physics background and experimental chemistry experience enable him to test quantum theories in the real world. “Even though physicists and chemists both study materials, physicists tend to look at them more as abstract equations, while chemists engage with their emergent properties,” Xu said. “Since I have a pure physics background and speak the language of chemistry, I can translate difficult theories into real space.”

With a few well-reasoned assumptions and some innovative techniques, Xu and his team bridge the gap the between quantum physics and chemistry, testing theories with materials. First, they predict which materials may realize topological properties. The chemical formulas for the elements in such materials do not provide adequate insight; Xu is also interested in their macroscopic properties.

“If I were to study water, steam, and ice only by looking at their H20 equation, I would learn nothing about their different properties.” Xu said. “As a chemist, I am trying to find certain elements and organize them microscopically, so that they can produce a topological property.”

Xu’s lab then tests current theories about chemical reactions against experimental data to expand the map of topological materials. Using specialized refrigerators in which atoms and molecules are cooled to temperatures just above absolute zero, at which they become highly controllable and more visible, Xu and his team test the flow of electrons through materials with currents.

They are also interested in the optical properties of materials, testing to see their interaction with light. The team fires photons at the materials and gathers quantum mechanical topological data based on how light scatters, reflects, and transmits. Xu has already yielded strong evidence for theoretical particles that answers one of the most vexing problems in quantum science.

In a study reported last year in Nature, Xu and his team set out to study the properties of axions, a theoretical elementary particle proposed by physicist Frank Wilczek. The Nobel Prize winner named it after a brand of laundry detergent because it “cleaned up” the complex, highly technical Strong Charge Parity problem in quantum chromodynamics by filling in a gap between theory and observation.

In addition one of the most enticing predictions about axion states is that we may be able to use them to control magnetization, which could revolutionize all kinds of technology as magnetism and magnetic materials are at the heart of many, many applications.

In a class of topological materials called axion insulators, Xu’s team sought to simulate the behavior of the axion. They fabricated a dual-gated MnBi2Te4 device in an argon environment, and measured its electrical and optical properties, uncovering new pathways to detect and manipulate the rich internal structure of topological materials.

“We discovered a real material that can support the axion insulator state,” Xu said. “We confirmed that it had the predicted properties, a strong coupling between electricity and magnetism.”

Having provided evidence for a theorized particle, Xu plans to explore the spin properties of Weyl semimetals, a new state of matter that has an unusual electronic structure that has deep analogies with particle physics and leads to unique topological properties.



Walk into Jacob Barandes’ new class and the topic of discussion might be a philosophical exploration of whether a cat could be simultaneously alive and dead. A visit on a different day may find the lecturer filling the blackboard with a mathematical equation that stretches 20 feet before continuing on a new line, over and over. Or students might be dissecting an example of classical physics such as Newton’s laws of motion.

So, exactly what kind of class is this?

It’s officially designated Physics 137, “Conceptual Foundations of Quantum Mechanics,” but it’s really part physics and part philosophy, with a hearty infusion of math and logic.

The subject sits within a much larger field called the philosophy of science, a branch of study that examines the theoretical foundations, methods, and implications of science in the real world. In this case, Barandes is applying the class’ inquiry to quantum theory.

“This is physics by scrutinizing,” said Barandes, who is also co-director of graduate studies for the Department of Physics. “This is taking our best scientific theories, dissecting them, disassembling them, looking at the pieces piece by piece, trying to understand them and how they fit together, and the larger wholes that they form.”

Quantum theory, which explains the nature and behavior of matter and energy on the atomic and subatomic levels, is often described as the best-tested and most predictive scientific theory out there, one that makes possible precision technology such as atomic clocks and particle accelerators. Much of our modern technology — including smartphones, lasers, LEDs, and MRI machines — relies on it.

But when it comes to painting a picture of the real world, quantum theory can feel unwieldy and counterintuitive. Take, for instance, the notion of particles being in more than one place at a time.

The class aims to explore why quantum theory contains so many strange and exotic mathematical structures and seemingly illogical possibilities and to get a sense of the different ways the world would appear depending on how aspects of the theory are interpreted.

It delves into the century-long effort to resolve these mysteries and hits on ideas from quantum theory like entanglement, superposition, and, of course, parallel universes and Schrödinger’s cat (both alive and dead in a box).

“[One of the goals is] to reformulate the classical picture as closely as we can to quantum theory so that we can pinpoint as precisely as possible what it is that we’re changing when we go from classical to the quantum case,” Barandes said.

What sets the class apart from many quantum physics courses is that this one is less about calculating numerical predictions and more about learning foundationally and logically how the theory works and what it tells us about the world around us. Through it all, students are encouraged to ask the ultimate philosophical question: Why?

At one recent class, for example, as Barandes was working through a quantum equation, a student’s hand shot up and Barandes was asked why he chose one specific example over another to illustrate the point of the lesson. The class then went into an extended debate over the logic behind that decision.

Lavanya Singh, a senior concentrating in computer science and philosophy, says this type of discussion usually wouldn’t happen in a more technically focused class.

“Why have we decided to model the system in this way? Why are these the operations we have chosen? What if we did it differently?” Singh said. “Those are usually questions that are not the point of a technical class, but in this class the [instructor] was really happy to entertain those questions because that is the point. The point is to understand why we are making the decisions that we are.”

Students say this level of understanding, especially when it comes to a theory as counterintuitive as quantum can be, is one of the main reasons they took the course.

Samuel Buckley-Bonanno.

Samuel Buckley-Bonanno and Lavanya Singh listen to a lecture.

“I studied quantum mechanics last year and found it as bewildering a subject as anything in physics,” said Samuel Buckley-Bonanno ’22. “I was still wondering about things in it that didn’t make any conceptual sense, so this seemed like the obvious class to take for me, and it’s proven to be really interesting. It’s changed many of the kinds of frameworks in which I’ve been thinking about these sorts of ideas.”

After devoting the first half of the semester to a historical survey, a review of classical physics concepts, and the transition to quantum theory, the second half will examine the internal logic of the theory. Students are eager to see what all that yields.

“Humanity is still confused about quantum theory,” Singh said. “It feels like the point of the class is helping me distinguish which are the questions I just don’t understand, and which questions are the ones humanity doesn’t understand.”



In Steven Spielberg’s 1977 film “Close Encounters of the Third Kind,” extraterrestrials communicate with humans through a catchy five-note sequence. In Spielberg’s 1982 blockbuster “E.T.,” a diminutive alien learns basic English from a children’s TV show. More recently, in 2016’s “Arrival,” squid-like visitors use pictograms to make themselves understood to American scientists wielding whiteboards with words.

But what would really happen if we made direct contact with an alien species? How would we recognize or interpret their intelligence, and what would we say? Those were just some of the questions discussed during a wide-ranging conversation Monday afternoon sponsored by Harvard’s Mind Brain Behavior Interfaculty Initiative and moderated by Edward J. Hall, Norman E. Vuilleumier Professor of Philosophy.

Using “Arrival” as a springboard, panelists Jesse Snedeker, a professor of psychology and expert in language comprehension, and Avi Loeb, an astrophysicist and author of “Extraterrestrial: The First Signs of Intelligent Life Beyond Earth” (2021), examined the potential challenges we might face.

Avi Loeb.

We should also be prepared for the possibility that aliens may not want to communicate with us all — just as we have no desire to communicate “with ants on the sidewalk,” says Avi Loeb, during a Zoom panel discussion.

Jon Chase/Harvard Staff Photographer

Loeb, the Frank B. Baird Jr. Professor of Science, has long argued the search for alien life should be taken more seriously in scientific circles. He said there are a range of factors to consider should we encounter an alien race. (Loeb’s book suggests a fast moving, pancake-shaped space rock that astronomers dubbed Oumuamua in 2017 might actually be a piece of interstellar technology.)

First, humans must try to conquer their sense that they are at “the pinnacle of creation” and instead understand that they are instead likely “somewhere in the middle of the distribution of intelligences in the Milky Way galaxy,” said Loeb, founding director of Harvard’s Black Hole Initiative. Earth’s inhabitants also have to be mindful of the “technological gap” that likely will exist between the human race and a messenger from beyond the solar system. (Such a messenger, he said, probably would arrive in the form of an artificial intelligence object capable of a making a journey lasting millions or even billions of years.)

Given a possible wide knowledge gap, we should also be prepared for the possibility that aliens may not want to communicate with us all, said Loeb, just as we have no desire to communicate “with ants on the sidewalk.”

Still, if we are able to directly engage as the “Arrival” scientists do, the challenge becomes how. Such a process would differ greatly from the search for alien life in years past, said Loeb, when people imagined any contact would likely come in the form of radio signals from extraterrestrials, which may have taken thousands of years to arrive. “However, if you have a visitor in your backyard, you better know what you’re doing,” he said, adding that we “might need our own AI systems to assist us in interpreting their AI systems.”

One potential challenge to communicating with extraterrestrials is the possibility that such beings may not possess a conceptual system similar to our own, Snedeker said. To illustrate she used the example of how children learn language. “When children hear a sentence like ‘The cat is on the mat,’ they have concepts roughly like cats, roughly like mats, and roughly like spatial relationships,” she said. In “Arrival,” actor Amy Adams, who plays a linguist, tries to recreate the “child language learning situation,” with the aliens by offering basic words to describe people and actions, all while assuming the aliens’ “conceptualization” is “reasonably similar,” to our own, Snedeker said.

But if those concepts “weren’t available to that other species, it’s unclear what any of those words would map onto,” she said. Still, Snedeker said she is optimistic that we might share some broad-level constructs with intelligent aliens who might also be the product of biological evolution. “I’m kind of hopeful that we’ll have enough in common with their conceptual structures,” she said, adding that “incomplete understanding is still understanding in some degree. If we had slightly different concepts than theirs or even substantially different, we [still] might get a long way toward understanding.”

Loeb, who is working on a documentary with the producer of “Arrival,” says remaining aloof from the search for intelligent life beyond our solar system is short-sighted. “We know that stars formed before the sun by billions of years. We know that they have planets like the Earth around them, so the environment that we have is not rare,” he said. But finding evidence of alien life requires the kind of funding and support awarded large-scale projects such as the search for cosmic gravitational waves or dark matter. “Given the public’s interest in the subject, the implications that it will have for the future of humanity, I think it’s actually non-intelligent on behalf of the scientific community not to engage with a search.”



You’ve probably seen the video — or at least heard some chirpings about it.

Footage from a security camera in Cuauhtémoc, a city in Chihuahua, Mexico, shows a massive flock of migratory birds swooping down like a cloud of black smoke and crashing onto pavement and the roof of a house. While many of the yellow-headed blackbirds recovered, about 100 died.

Ever since the mass crash, on Feb. 7, viewers of the viral video have sought to explain what happened. Suggestions from scientists and anyone with a Twitter account have included: the birds were reacting to a predator, inhaled toxic fumes, were zapped by a power line, or became victims of electromagnetic interference. Some sleuths have floated 5G technology as the culprit.

Harvard ornithologist Scott V. Edwards, Alexander Agassiz Professor of Organismal and Evolutionary Biology, and Flavia Termignoni Garcia, a postdoctoral researcher from his lab who studies bird behavior, believe the truth lies in flock dynamics.

They say that when migratory birds fly in large flocks, they follow the leader. One bird sets the pace and direction, the others just go along with what everyone else is doing. “They’re not looking very distant; they’re actually following their closest neighbor in the flock so basically taking cues on where to move based on their closest neighbor,” Edwards said.

Yellow-headed blackbirds, which live primarily in the northern U.S. and Canada but winter in Mexico, have ben known to travel in groups of 3,000, so it’s easy to see how one mistake could lead many to their doom.

“Maybe the leader of the flock somehow didn’t know they were close to the ground,” Edwards said. “If that’s the case, then most of the birds in the flock wouldn’t know they’re close to the ground. Maybe some sort of stochastic event caused the leader of the flock to dodge something — maybe it was dodging the wires or maybe it just made a mistake. The point is, most of the birds would follow rather than be aware of where they actually were in 3D space.”

Termignoni Garcia focused on the laminated roofs of the houses. From above, these roofs reflect light the same way a body of water does, so the birds might have been looking for a quick drink. By the time they realized they were wrong, there was no turning back. “They were too close.”

Migratory birds are known to make fatal mistakes, often involving reflective glass. Last year, hundreds of songbirds crashed into skyscrapers in New York. “These phenomena are caused by the constant process of urbanization and that they will be more frequent as our cities grow,” said Termignoni Garcia.

The researchers were skeptical of the many internet theories about the birds of Cuauhtémoc. First, it’s clear in the video that they weren’t disoriented but were flying extremely fast. If they had inhaled poisonous gases or been shocked, the physics of their movement would have been entirely different. (There’s also the fact that toxic fumes would have affected other wildlife in the area.) As for 5G interference, Edwards and Termignoni Garcia shook their heads.

The bird-loving scientists hope the survivors make it to where they were headed without further incident. “I was watching the ones that were still on the ground and hoping they would get up and fly,” Edwards said.



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