The American conventional wisdom about weight loss is simple: A calorie deficit is all that’s required to drop excess pounds, and moderating future calorie consumption is all that’s required to maintain it. To the idea’s adherents, the infinite complexity of human biology acts as one big nutritional piggy bank. Anyone who gains too much weight or loses weight and gains it back has simply failed to balance the caloric checkbook, which can be corrected by forswearing fatty food or carbs.

Endocrinologists have known for decades that the science of weight is far more complicated than calorie deficits and energy expenditures. And in 2016, the fickle complexity of weight came to broad national attention. In a study of former contestants on a season of the weight-loss reality show The Biggest Loser, scientists found that years later, the contestants not only had gained back much or all of the weight they’d lost on the show, but also had far weaker metabolisms than most people their size. The contestants’ bodies had fought for years to regain the weight, contrary to the contestants’ efforts and wishes. No one was sure why.

Robert Spada walked into the decrepit warehouse in Detroit and surveyed the chaos: Thousands of cardboard boxes and large plastic bags were piled haphazardly throughout the cavernous space. The air inside was hot and musty. Spada, an assistant prosecutor, saw that some of the windows were open, others broken, exposing the room to the summer heat. Above the boxes, birds glided in slow, swooping circles.

It was August 17, 2009, and this brick fortress of a building housed evidence that had been collected by the Detroit Police Department. Spada’s visit had been prompted by a question: Why were police sometimes unable to locate crucial evidence? The answer lay in the disarray before him.

In his racist attacks on four Democratic congresswomen of color, Donald Trump violated the norms of civilized public discourse in ways no modern president has come close to doing. And in their effort to condemn the president’s virulent remarks, the House Democratic majority dispensed—by raw party-line vote—with parliamentary niceties dating to the pen of Thomas Jefferson himself.

Welcome to another great moment in Washington 2019, where the 45th president seems more determined than ever to keep defining deviancy down, and to encourage everyone else to see the moral high ground as just another slippery and shifting partisan slope.

The day began normally enough for this non-normal age, with Speaker Nancy Pelosi determined to pass a non-binding resolution rebuking Trump’s series of tweets attacking the four Democratic members as America-hating socialists who should “go back” to where they came from, even though all but one of them were born in the United States.

District of Columbia v. Heller, which recognized an individual right to possess a firearm under the Constitution, is unquestionably the most clearly incorrect decision that the Supreme Court announced during my tenure on the bench.

The text of the Second Amendment unambiguously explains its purpose: “A well regulated militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.” When it was adopted, the country was concerned that the power of Congress to disarm the state militias and create a national standing army posed an intolerable threat to the sovereignty of the several states.

The first quotation from Donald Trump ever to appear in The New York Times came on October 16, 1973. Trump was responding to charges filed by the Justice Department alleging racial bias at his family’s real-estate company. “They are absolutely ridiculous,” Trump said of the charges. “We have never discriminated, and we never would.”

In the years since then, Trump has assembled a long record of comment on issues involving African Americans as well as Mexicans, Hispanics more broadly, Native Americans, Muslims, Jews, immigrants, women, and people with disabilities.

Editor's Note: This article is part of a series reflecting on the Apollo 11 mission, 50 years later.

Without the computers on board the Apollo spacecraft, there would have been no moon landing, no triumphant first step, no high-water mark for human space travel. A pilot could never have navigated the way to the moon, as if a spaceship were simply a more powerful airplane. The calculations required to make in-flight adjustments and the complexity of the thrust controls outstripped human capacities.

The Apollo Guidance Computer, in both its guises—one on board the core spacecraft, and the other on the lunar module—was a triumph of engineering. Computers had been the size of rooms and filled with vacuum tubes, and if the Apollo computer, at 70 pounds, was not exactly miniature yet, it began “the transition between people bragging about how big their computers are … and bragging about how small their computers are,” the MIT aerospace and computing historian David Mindell once joked in a lecture.

I live in envy. I envy the people who know their nationality. All the people whose nationality has never been a question in their mind.

I can imagine the woman staring at her reflection in the Volta River who knows she’s Ghanaian, like her ancestors who liberated their people in 1957 and chose the mighty pre-colonial Ghana as the name of their new nation. I can imagine the woman flying into Frankfurt who knows she’s German, who knows she’s arriving back home. I can imagine the man working on his antique car outside his home in Biloxi, forehead covered by the prized blood-red baseball cap he purchased at a rally back in November, a man who has never been told, “Go back to your country!” If somehow someone did tell him, it would confuse him as much as it would the Ghanaian or German woman. It would be like someone driving by his house and shouting at him, “Go back to your home!”

"It’s not true that no one needs you anymore.”

These words came from an elderly woman sitting behind me on a late-night flight from Los Angeles to Washington, D.C. The plane was dark and quiet. A man I assumed to be her husband murmured almost inaudibly in response, something to the effect of “I wish I was dead.”

Again, the woman: “Oh, stop saying that.”

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I didn’t mean to eavesdrop, but couldn’t help it. I listened with morbid fascination, forming an image of the man in my head as they talked. I imagined someone who had worked hard all his life in relative obscurity, someone with unfulfilled dreams—perhaps of the degree he never attained, the career he never pursued, the company he never started.

At first glance, the classroom I was visiting at a high-poverty school in Washington, D.C., seemed like a model of industriousness. The teacher sat at a desk in the corner, going over student work, while the first graders quietly filled out a worksheet intended to develop their reading skills.

As I looked around, I noticed a small girl drawing on a piece of paper. Ten minutes later, she had sketched a string of human figures, and was busy coloring them yellow.

I knelt next to her and asked, “What are you drawing?”

“Clowns,” she answered confidently.

“Why are you drawing clowns?”

“Because it says right here, ‘Draw clowns,’ ” she explained.

Running down the left side of the worksheet was a list of reading-comprehension skills: finding the main idea, making inferences, making predictions. The girl was pointing to the phrase draw conclusions. She was supposed to be making inferences and drawing conclusions about a dense article describing Brazil, which was lying facedown on her desk. But she was unaware that the text was there until I turned it over. More to the point, she had never heard of Brazil and was unable to read the word.

Last April, I received an odd email from a man named Matthew Cox. “I am an inmate at the Coleman Federal Correctional Complex in Florida,” he wrote. “I’m also a true crime writer.” He had one year left on his sentence and was “attempting to develop a body of work that will allow me to exit prison with a new career.” He included a story about a fellow inmate who’d been ensnared in a complicated currency-trading scam, hoping that I’d write about it for The Atlantic.

“This is fascinating,” I replied. I didn’t mean the currency-trading scam, which was too procedural for my tastes, but Cox’s own trajectory. He described himself as “an infamous con man writing his fellow inmates’ true crime stories while immersed in federal prison.” I’d never had a possible subject pitch his own tale so aptly. I wasn’t entirely sure that was a good thing.