december 1883

Members of Heaven’s Gate, a religious cult, believed that as the Hale-Bopp comet passed by Earth in 1997, a spaceship would be traveling in its wake—ready to take true believers aboard. Several members of the group bought an expensive, high-powered telescope so that they might get a clearer view of the comet. They quickly brought it back and asked for a refund. When the manager asked why, they complained that the telescope was defective, that it didn’t show the spaceship following the comet. A short time later, believing that they would be rescued once they had shed their “earthly containers” (their bodies), all 39 members killed themselves.

Heaven’s Gate followers had a tragically misguided conviction, but it is an example, albeit extreme, of cognitive dissonance, the motivational mechanism that underlies the reluctance to admit mistakes or accept scientific findings—even when those findings can save our lives. This dynamic is playing out during the pandemic among the many people who refuse to wear masks or practice social distancing. Human beings are deeply unwilling to change their minds. And when the facts clash with their preexisting convictions, some people would sooner jeopardize their health and everyone else’s than accept new information or admit to being wrong.

The first time Representative Karen Bass heard Joe Biden talk about the car crash that killed his wife and infant daughter, she dropped into her chair, overwhelmed.

It was 2008, and Bass was watching the Democratic National Convention video introducing Biden as the party’s vice-presidential nominee. Less than two years earlier, Bass’s daughter and son-in-law had died in a car crash on the 405. Bass, then in her 50s, had thrown herself into her job as the speaker of the California assembly and hoped to get past the pain. But there was Biden, 36 years after the tragedy that shattered his family, still talking about the magnitude of his loss. “I had this moment,” Bass told me, “where I had to come to grips with the fact that losing my daughter and son-in-law was always going to be a part of the narrative of who I am.”

Edward Lorenz was just out of college when he was recruited into World War II. He was assigned to be a weather forecaster, despite having no experience in meteorology. What Lorenz knew was math.

So he started experimenting with differential equations, trying to make predictions based on patterns in data on past temperatures and pressures. One day, while testing his system, he repeated a simulation with a few decimals rounded off in the data. To his surprise, a radically different future emerged.

He called this finding “the butterfly effect.” In a complex model, where each day’s weather influences the next day’s, a tweak in initial conditions can have wild downstream consequences. The butterfly effect became central to the emerging field of chaos theory, which has since been applied to economics, sociology, and many other subjects, in attempts to deconstruct complex phenomena. That field is now helping predict the future of the pandemic—in particular, how it ends.

Updated at 1:40 p.m. ET on July 9, 2020.

For the past few weeks, I have been obsessed with a mystery emerging in the national COVID-19 data.

Cases have soared to terrifying levels since June. Yesterday, the U.S. had 62,000 confirmed cases, an all-time high—and about five times more than the entire continent of Europe. Several U.S. states, including Arizona and Florida, currently have more confirmed cases per capita than any other country in the world.

But average daily deaths are down 75 percent from their April peak. Despite higher death counts on Tuesday and Wednesday, the weekly average has largely plateaued in the past two weeks.

The gap between spiking cases and falling-then-flatlining deaths has become the latest partisan flashpoint. President Donald Trump has brushed off the coronavirus surge by emphasizing the lower death rate, saying that “99 percent of [COVID-19 cases] are totally harmless.” On Tuesday, Anthony Fauci, the director of the National Institute of Allergy and Infectious Diseases, warned Americans against “[taking] comfort in the lower rate of death” just hours before Trump tweeted triumphantly: “Death Rate from Coronavirus is down tenfold!”

American presidents customarily leave office when voters reject them. Czars, emperors, and would-be prime ministers for life do whatever they can to hold on to power. To extend his rule until 2036, Russian President Vladimir Putin recently held a referendum to amend his country’s constitution. While some Russians publicly opposed the proposal, few had any doubt about the outcome. Two years ago, Chinese President Xi Jinping succeeded in eliminating term limits that had been established after Mao Zedong’s Cultural Revolution—a period of ideological madness that killed tens of millions of people, including family members of the country’s ruling class.