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.

Raj Chetty got his biggest break before his life began. His mother, Anbu, grew up in Tamil Nadu, a tropical state at the southern tip of the Indian subcontinent. Anbu showed the greatest academic potential of her five siblings, but her future was constrained by custom. Although Anbu’s father encouraged her scholarly inclinations, there were no colleges in the area, and sending his daughter away for an education would have been unseemly.

But as Anbu approached the end of high school, a minor miracle redirected her life. A local tycoon, himself the father of a bright daughter, decided to open a women’s college, housed in his elegant residence. Anbu was admitted to the inaugural class of 30 young women, learning English in the spacious courtyard under a thatched roof and traveling in the early mornings by bus to a nearby college to run chemistry experiments or dissect frogs’ hearts before the men arrived. Anbu excelled, and so began a rapid upward trajectory. She enrolled in medical school. “Why,” her father was asked, “do you send her there?” Among their Chettiar caste, husbands commonly worked abroad for years at a time, sending back money, while wives were left to raise the children. What use would a medical degree be to a stay-at-home mother?

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 its 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 nonbinding 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.

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.

Some conservative national-security practitioners gathered recently to find common ground on the future. The meeting wasn’t, as described in The Washington Post, flooded with regretful signatories of various anti-Trump letters, recanting in the hopes of career advancement. In attendance were people who had served in the Trump administration and people who’d refused to serve, united by a desire to restore principled national-security policies. What follows is an abbreviated version of my paper for the gathering, which was on how to engage young Americans with conservative principles.

In my experience, conservative foundational beliefs appeal to our successors. We can win over young Americans to our principles, but first we have to live by those principles. Americans under age 30 voted for Democrats by a 35-point margin in 2018 in large part because we don’t.

America needs teachers: A majority of the country’s most experienced K–12 educators are expected to retire in the next few years, while research suggests that thousands of others will likely leave the profession prematurely, citing job dissatisfaction. How to get more people to join the profession? A little more than a decade ago, policy makers came up with one idea they thought would help: Give teachers some extra support in paying off their student loans. So, in 2007, Congress tasked the U.S. Department of Education, which administers federal financial aid, with offering student-debt relief to recent graduates in public-service career: Essentially, make your minimum monthly payments for 10 years and your loans will be erased.

1. The Disappearance

At 12:42 a.m. on the quiet, moonlit night of March 8, 2014, a Boeing 777-200ER operated by Malaysia Airlines took off from Kuala Lumpur and turned toward Beijing, climbing to its assigned cruising altitude of 35,000 feet. The designator for Malaysia Airlines is MH. The flight number was 370. Fariq Hamid, the first officer, was flying the airplane. He was 27 years old. This was a training flight for him, the last one; he would soon be fully certified. His trainer was the pilot in command, a man named Zaharie Ahmad Shah, who at 53 was one of the most senior captains at Malaysia Airlines. In Malaysian style, he was known by his first name, Zaharie. He was married and had three adult children. He lived in a gated development. He owned two houses. In his first house he had installed an elaborate Microsoft flight simulator.

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!”

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.