Updated at 2:15 p.m. ET on October 13, 2019.

Early yesterday morning, in a misty park in Vienna, Eliud Kipchoge ran a marathon in less than two hours. His time, 1:59:40, is the fastest any runner has ever covered 26.2 miles. Kipchoge carved two minutes off his own world record and became the first marathoner to break the two-hour barrier.

At the event, branded the INEOS 1:59 Challenge, the performance was heralded as a radical, historic leap, his “Neil Armstrong moment,” as one announcer said. Indeed, Kipchoge himself—a soft-spoken 34-year-old Kenyan who dulls the pain of distance running by smiling mid-competition—has repeatedly equated his feat to reaching the moon. That comparison is audacious on the scale of human achievement, but in the galaxy of running, it might actually be an understatement. Running’s original moon landing, the sub-four-minute mile, took place back in 1954. Yesterday, Kipchoge launched running to Mars.

Karthic Thallikar first noticed the noise sometime in late 2014, back when he still enjoyed taking walks around his neighborhood.

He’d been living with his wife and two kids in the Brittany Heights subdivision in Chandler, Arizona, for two years by then, in a taupe two-story house that Thallikar had fallen in love with on his first visit. The double-height ceilings made it seem airy and expansive; there was a playground around the corner; and the neighbors were friendly, educated people who worked in auto finance or at Intel or at the local high school. Thallikar loved that he could stand in the driveway, look out past a hayfield and the desert scrub of Gila River Indian land, and see the jagged pink outlines of the Estrella Mountains. Until recently, the area around Brittany Heights had been mostly farmland, and there remained a patchwork of alfalfa fields alongside open ranges scruffy with mesquite and coyotes.

Just under a century ago, the Soviet Union embarked on one of the strangest attempts to reshape the common calendar that has ever been undertaken. As Joseph Stalin raced to turn an agricultural backwater into an industrialized nation, his government downsized the week from seven to five days. Saturday and Sunday were abolished.

In place of the weekend, a new system of respite was introduced in 1929. The government divided workers into five groups, and assigned each to a different day off. On any given day, four-fifths of the proletariat would show up to their factories and work while the other fifth rested. Each laborer received a colored slip of paper—yellow, orange, red, purple, or green—that signified his or her group. The staggered schedule was known as nepreryvka, or the “continuous workweek,” since production never stopped.

Where in the pantheon of American commercial titans does Jeffrey Bezos belong? Andrew Carnegie’s hearths forged the steel that became the skeleton of the railroad and the city. John D. Rockefeller refined 90 percent of American oil, which supplied the pre-electric nation with light. Bill Gates created a program that was considered a prerequisite for turning on a computer.

At 55, Bezos has never dominated a major market as thoroughly as any of these forebears, and while he is presently the richest man on the planet, he has less wealth than Gates did at his zenith. Yet Rockefeller largely contented himself with oil wells, pump stations, and railcars; Gates’s fortune depended on an operating system. The scope of the empire the founder and CEO of Amazon has built is wider. Indeed, it is without precedent in the long history of American capitalism.

In June 2016, Chauncy Black rode the bus from his home in South Memphis to one of the city’s whiter, wealthier neighborhoods. The 16-year-old helped his grandmother pay the bills by doing odd jobs for neighbors, and on this afternoon he was headed for the rich-person Kroger supermarket to try something new: approaching shoppers who’d just bought hundreds of dollars’ worth of groceries and offering to take their bags to the car for a few bucks. It had seemed like a good idea, but in practice it was dispiriting. People ignored him; they wouldn’t even look him in the eye.

Sometime after 9 p.m., Chauncy filled a box with a dozen donuts and approached a tall white man in his 30s. In exchange for buying him this “dinner,” Chauncy told the guy, he’d carry his groceries. Matt White bought Chauncy the donuts—and cereal and peanut butter and toothbrushes and frozen vegetables, too.

Although the number of dual-career couples is rising, equal partnerships have not necessarily become the norm. Despite much talk about splitting housework, there is a surprising lack of guidance on how exactly to address the deeper challenges that these couples face, such as when and where to relocate, how to split parenting responsibilities, or how to honor both partners’ ambitions. I have spent the past five years studying more than 100 working couples around the world to learn how they combine two careers and a relationship. Most of the couples I interviewed aspired to split their responsibilities at home and at work equally, but few managed to really do so. For many, resentment and guilt festered, and equality became a mirage.

For most of the past two decades, American troops have been deployed all over the world—to about 150 countries. During that time, hundreds of thousands of young men and women have experienced combat, and a generation of officers have come of age dealing with the practical realities of war. They possess a deep well of knowledge and experience. For the past three years, these highly trained professionals have been commanded by Donald Trump.

To get a sense of what serving Trump has been like, I interviewed officers up and down the ranks, as well as several present and former civilian Pentagon employees. Among the officers I spoke with were four of the highest ranks—three or four stars—all recently retired. All but one served Trump directly; the other left the service shortly before Trump was inaugurated.

Thomas Alva Edison listened with his teeth. The inventor of the phonograph was completely deaf in one ear and could barely hear in the other, the result of a mysterious affliction in his childhood. To appreciate a delicate tune emanating from a music player or piano, he would chomp into the wood and absorb the sound waves into his skull. From there they would pass through the cochlea and into the auditory nerve, which would ferry the melody to his prodigious brain. Edison’s approach to music consumption had curious side effects, beyond the visible bite marks all over his phonographs. He couldn’t hear at the highest frequencies, couldn’t stand vocal vibrato, and declared Mozart’s music an affront to melody. But his inner ear was so sensitive that he could dazzle sound engineers by pinpointing subtle flaws in their recordings, such as a squeaky flute key among the woodwinds.

If Australia exits the Rugby World Cup this coming week in Japan, Americans will lose their last chance to watch one of the best athletes they’ve likely never heard of.

David Pocock, although born in Zimbabwe, has been a mainstay of the Australian rugby team for a decade. At his destructive best, he has been among the world’s top players, tormenting opponents with his uncanny ability to disrupt their attack. At 31, he has announced his retirement from the Australian national team at the conclusion of the World Cup.

But the mark that Pocock has left off the field may end up being better remembered than anything he has done on it. Pocock is among the more eclectic and politically engaged athletes his adopted country has ever produced. In 2014, he chained himself to mining equipment in rural New South Wales to protest the expansion of a coal mine. He and his longtime partner, Emma Palandri, famously refused to get married until gay couples were allowed to do the same—prompting some good-natured teasing when same-sex marriage was finally made legal in 2017. (The couple wed late last year.) He has been active supporting anti-poaching initiatives, sustainable farming, and poverty reduction back in Zimbabwe—which his family left in 2002 amid a wave of violence against white farmers. Pocock even paints his cleats all black to obscure any logos. Because he can’t be sure of the labor conditions that produced the shoes, he explained when I interviewed him two years ago, he doesn’t want to be seen as endorsing the manufacturer.

A lot of factors have contributed to American inequality: slavery, economic policy, technological change, the power of lobbying, globalization, and so on. In their wake, what’s left?

That’s the question at the heart of a new book, The Vanishing Middle Class: Prejudice and Power in a Dual Economy, by Peter Temin, an economist from MIT. Temin argues that, following decades of growing inequality, America is now left with what is more or less a two-class system: One small, predominantly white upper class that wields a disproportionate share of money, power, and political influence and a much larger, minority-heavy (but still mostly white) lower class that is all too frequently subject to the first group’s whims.