This week, retired Admiral William McRaven published an unsparing open letter to President Trump requesting that, in the wake of the president’s decision to strip former CIA Director John Brennan of a security clearance, the president grant him the same honor. It is a startling intervention by a luminary of military leadership—the man responsible for the raid that killed Osama Bin Laden—who has not previously publicly criticized this president, nor any other for that matter.

To understand the meaning of McRaven’s intervention, one must recognize the ongoing challenge faced by former national security officials and military officers regarding appropriate responses to this president. National security is supposed to exist apart from politics—the identity of the president might change the list of national intelligence priorities or military objectives, but the job stays the same. This is a realm in which everyone is supposed to be on the same team; permitting cracks in that foundation leads to rapid erosion. Even after retirement, former military officers and similarly situated national security officials typically refrain from overt political participation: What is a formal rule during the period of service transforms into a powerful norm of silence upon return to civilian life. The candidacy and presidency of Donald Trump has upended this tradition.

Gerta Keller was waiting for me at the Mumbai airport so we could catch a flight to Hyderabad and go hunt rocks. “You won’t die,” she told me cheerfully as soon as I’d said hello. “I’ll bring you back.”

Death was not something I’d considered as a possible consequence of traveling with Keller, a 73-year-old paleontology and geology professor at Princeton University. She looked harmless enough: thin, with a blunt bob, wearing gray nylon pants and hiking boots, and carrying an insulated ShopRite supermarket bag by way of a purse.

I quickly learned that Keller felt such reassurances were necessary because, appropriately for someone who studies mass extinctions, she has a tendency to attract disaster.

Medical school costs a lot of money that a lot of people don’t have. That often means students do a bit of cost-benefit analysis: Is it worth it to take on hundreds of thousands of dollars of debt now for the possibility of making hundreds of thousands of dollars a year later?

New York University’s School of Medicine is trying remove that calculation as a factor in students’ career decision making. The school announced yesterday that it will provide all new, future, and current students a full-tuition scholarship—financial need and merit aside, meaning wealthy students and low-income students alike will receive it. The scholarship doesn’t cover the rest of the costs associated with college—housing, food, child care—but it takes $55,018 a year out of the picture.

On Thursday night, The New York Times published an interview with Elon Musk that offers a view into the billionaire entrepreneur’s life in the last year. Musk choked up “multiple times,” the Times reported in the story, and “alternated between laughter and tears.” He explained that he was overworked at Tesla, his electric-car company—which has spent the past several months scrambling to meet ambitious production goals—and that the situation has taken a toll on his physical health, family time, and social life.

“I thought the worst of it was over—I thought it was,” Musk said. “The worst is over from a Tesla operational standpoint. But from a personal pain standpoint, the worst is yet to come.”

I am staring at a photograph of myself that shows me 20 years older than I am now. I have not stepped into the twilight zone. Rather, I am trying to rid myself of some measure of my present bias, which is the tendency people have, when considering a trade-off between two future moments, to more heavily weight the one closer to the present. A great many academic studies have shown this bias—also known as hyperbolic discounting—to be robust and persistent.

Most of them have focused on money. When asked whether they would prefer to have, say, $150 today or $180 in one month, people tend to choose the $150. Giving up a 20 percent return on investment is a bad move—which is easy to recognize when the question is thrust away from the present.

You’re at a party and you see someone cute across the room. They glance at you, maybe even smile for a second, then carry on with their conversation. You feel the room shrink, your heart rate quicken, your face go red: You’re crushing on this stranger, hard. But then the sensible part of your brain tells you to forget it: That person’s way, way out of your league.

Wait a second, you counter: Do dating “leagues” even exist?

At this point, Elizabeth Bruch, a professor of sociology at the University of Michigan, crashes in to your thought process (and this news article). Yep, she says. Leagues do seem to exist. But you’re not alone in trying to escape yours: “Three-quarters, or more, of people are dating aspirationally,” she says. And according to a new study, users of online-dating sites spend most of their time trying to contact people “out of their league.”

Forty-one million IQ points. That’s what Dr. David Bellinger determined Americans have collectively forfeited as a result of exposure to lead, mercury, and organophosphate pesticides. In a 2012 paper published by the National Institutes of Health, Bellinger, a professor of neurology at Harvard Medical School, compared intelligence quotients among children whose mothers had been exposed to these neurotoxins while pregnant to those who had not. Bellinger calculates a total loss of 16.9 million IQ points due to exposure to organophosphates, the most common pesticides used in agriculture.

Last month, more research brought concerns about chemical exposure and brain health to a heightened pitch. Philippe Grandjean, Bellinger’s Harvard colleague, and Philip Landrigan, dean for global health at Mount Sinai School of Medicine in Manhattan, announced to some controversy in the pages of a prestigious medical journal that a “silent pandemic” of toxins has been damaging the brains of unborn children. The experts named 12 chemicals—substances found in both the environment and everyday items like furniture and clothing—that they believed to be causing not just lower IQs but ADHD and autism spectrum disorder. Pesticides were among the toxins they identified.

Settling into a sense of safety is hard when your life’s catalog of memories teaches you the opposite lesson. Imagine: You fled from a government militia intent on murdering you; swam across a river with the uncertain hope of sanctuary on the far bank; had the dawning realization that you could never return to your village, because it had been torched; and heard pervasive rumors of former neighbors being raped and enslaved. Imagine that, following all this, you then found yourself in New York City, with travel documents that were unreliable at best.

To hear more feature stories, see our full list or get the Audm iPhone app.

This is the shared narrative of thousands of emigrants from the West African nation of Mauritania. The country is ruled by Arabs, but these refugees were members of a black subpopulation that speaks its own languages. In 1989, in a fit of nationalism, the Mauritanian government came to consider these differences capital offenses. It arrested, tortured, and violently expelled many black citizens. The country forcibly displaced more than 70,000 of them and rescinded their citizenship. Those who remained behind fared no better. Approximately 43,000 black Mauritanians are now enslaved—by percentage, one of the largest enslaved populations in the world.

LONDON—For more than a year, the British government has insisted that the only thing worse than leaving the European Union with no deal would be to leave it with a bad one. Implicit in this proclamation was that Britons would have nothing to fear if negotiations between the U.K. and the EU went sour; that while every effort would be made to get the best deal for Britain, Britons would never have to bow to European demands U.K. voters thought unreasonable.

But nearly two years on, the forecast for a “no deal” Brexit—in which the U.K. would leave the EU without an agreement on the terms of its withdrawal or their future trading relationship—has started to look grim. Recent concerns over potential food shortages prompted the newly appointed Brexit Secretary Dominic Raab to offer what for a wealthy nation was the remarkable assurance that the government will “make sure that there is adequate food supplies.” Health Secretary Matt Hancock, facing similar anxieties over the possibility of medicine shortages, confirmed that the National Health Service would prepare to stockpile essential materials, including vaccines and blood products.

The goldfish were the first to vanish. Every so often, a few would go missing overnight from the office’s tiny outdoor pond. But goldfish were cheap, so no one in the building—an environmental nonprofit in the bustling, sweaty center of Colombo, Sri Lanka—bothered investigating.

Then the dragon koi began to disappear. Lustrous and ethereal, each of these whiskered Japanese carp cost around 10,000 Sri Lankan rupees, or $65. In a fit of extravagance, the building’s landlord had bought 10. Soon, he had seven. Then three.

Panicked, the landlord installed four security cameras to catch the thief. The pond rested at the end of a narrow driveway surrounded by tall concrete walls, so whoever was swiping the carp had either a key or the superhuman ability to bound up nearby roofs and drop in undetected. The landlord couldn’t imagine what kind of person would steal a fish, but he was eager to find out.