There’s no place like home—unless you’re Elon Musk. A prototype of SpaceX’s Starship, which may someday send humans to Mars, is, according to Musk, likely to launch soon, possibly within the coming days. But what motivates Musk? Why bother with Mars? A video clip from an interview Musk gave in 2019 seems to sum up Musk’s vision—and everything that’s wrong with it.

In the video, Musk is seen reading a passage from Carl Sagan’s book Pale Blue Dot. The book, published in 1994, was Sagan’s response to the famous image of Earth as a tiny speck of light floating in a sunbeam—a shot he’d begged NASA to have the Voyager 1 spacecraft take in 1990 as it sailed into space, 3.7 billion miles from Earth. Sagan believed that if we had a photo of ourselves from this distance, it would forever alter our perspective of our place in the cosmos.

Say you're a Godly fellow of pure heart and intention in the seventh century, and you've met a lady, and the two of you would like to have some sex. There are so many rules, though. Where does one begin?

Penitentials were handbooks carried by some priests in the Middle Ages that delineated various sins for private confession and their penances. They were full of strict limitations as to what constituted pious behavior. They went on and on. To digest it all, James A Brundage, a scholar of the Crusades, aggregated the complex rules about sex into this excellent flowchart.

Brundage originally published the chart in his book Law, Sex, and Christian Society in Medieval Europe, which is now a standard text in Medieval history, lauded on several sites like The History Blog. The book's publisher, upon learning of my appreciation for this chart, allowed me to share it here as well.

When the polio vaccine was declared safe and effective, the news was met with jubilant celebration. Church bells rang across the nation, and factories blew their whistles. “Polio routed!” newspaper headlines exclaimed. “An historic victory,” “monumental,” “sensational,” newscasters declared. People erupted with joy across the United States. Some danced in the streets; others wept. Kids were sent home from school to celebrate.

One might have expected the initial approval of the coronavirus vaccines to spark similar jubilation—especially after a brutal pandemic year. But that didn’t happen. Instead, the steady drumbeat of good news about the vaccines has been met with a chorus of relentless pessimism.

The world of Danish children’s television is not for the prudish. Kids who turn on the tube in Denmark might be greeted by gratuitous flatulence, cursing, casual nudity, or cross-dressing puppets. One show centers on a pipe-smoking pirate who wallops ninjas and flirts with Satanism. In another, an audience of 11-to-13-year-olds asks probing questions about the bodies of adults who disrobe before them. As Christian Groes, an anthropologist at Denmark’s Roskilde University, told me, Danish children’s television is not unlike an LSD trip: “Everything is possible in that universe,” he said, loosely quoting a friend, “and people won’t complain about it.”

But people did complain when the Danes debuted a kids’ animated series in January featuring a protagonist with an absurdly long, prehensile penis.

adam Kinzinger is a liberated individual—liberated from his party leadership, liberated from the fear of being beaten in a primary, liberated to speak his mind. The 43-year-old representative was one of 10 House Republicans who voted to impeach Donald Trump for inciting the attack on the U.S. Capitol.

“I don’t have a constitutional duty to defend against a guy that is a jerk and maybe says some things I don’t like,” Kinzinger told me, explaining what had pushed him to finally break with the president. “I do when he’s getting ready to destroy democracy—and we saw that culminate on January 6th.”

This was the sort of language a number of Republicans used in the immediate aftermath of the riot. “The president bears responsibility for Wednesday’s attack on Congress by mob rioters,” House Minority Leader Kevin McCarthy said on January 13. But by the end of the month, McCarthy was traveling hat in hand to Mar-a-Lago to meet with Trump.

We are living in a time of bad metaphors. Everything is fascism, or socialism; Hitler’s Germany, or Stalin’s Soviet Union. Republicans, especially, want their followers to believe that America is on the verge of a dramatic time, a moment of great conflict such as 1968—or perhaps, even worse, 1860. (The drama is the point, of course. No one ever says, “We’re living through 1955.”)

Ironically, the GOP is indeed replicating another political party in another time, but not as the heroes they imagine themselves to be. The Republican Party has become, in form if not in content, the Communist Party of the Soviet Union of the late 1970s.

I can already hear the howls about invidious comparisons. I do not mean that modern American Republicans are communists. Rather, I mean that the Republicans have entered their own kind of end-stage Bolshevism, as members of a party that is now exhausted by its failures, cynical about its own ideology, authoritarian by reflex, controlled as a personality cult by a failing old man, and looking for new adventures to rejuvenate its fortunes.

To climate scientists, clouds are powerful, pillowy paradoxes. They can reflect away the sun’s heat but also trap it in the atmosphere; they can be products of warming temperatures but can also amplify their effects. Now, while studying the atmospheric chemistry that produces clouds, researchers have uncovered an unexpectedly potent natural process that seeds their growth. And as the Earth continues to warm from rising levels of greenhouse gases, this process could be a major new mechanism for accelerating the loss of sea ice at the poles—one that no global climate model currently incorporates.

This discovery emerged from studies of aerosols: the tiny particles suspended in air onto which water vapor condenses to form clouds. As described this month in a paper in Science, researchers have identified a powerful yet overlooked source of cloud-making aerosols in pristine, remote environments: iodine.

At about 2 a.m. on Thursday morning, I woke to find my husband shivering beside me. For hours, he had been tossing in bed, exhausted but unable to sleep, nursing chills, a fever, and an agonizingly sore left arm. His teeth chattered. His forehead was freckled with sweat. And as I lay next to him, cinching blanket after blanket around his arms, I felt an immense sense of relief. All this misery was a sign that the immune cells in his body had been riled up by the second shot of a COVID-19 vaccine, and were well on their way to guarding him from future disease.

Side effects are a natural part of the vaccination process, as my colleague Sarah Zhang has written. Not everyone will experience them. But the two COVID-19 vaccines cleared for emergency use in the United States, made by Pfizer/BioNTech and Moderna, already have reputations for raising the hackles of the immune system: In both companies’ clinical trials, at least a third of the volunteers ended up with symptoms such as headaches and fatigue; fevers like my husband’s were less common.

Every day, more than 1 million American deltoids are being loaded with a vaccine. The ensuing immune response has proved to be extremely effective—essentially perfect—at preventing severe cases of COVID-19. And now, with yet another highly effective vaccine on the verge of approval, that pace should further accelerate in the weeks to come.

This is creating a legion of people who no longer need to fear getting sick, and are desperate to return to “normal” life. Yet the messaging on whether they might still carry and spread the disease—and thus whether it’s really safe for them to resume their unmasked, un-distanced lives—has been oblique. Anthony Fauci said last week on CNN that “it is conceivable, maybe likely,” that vaccinated people can get infected with the coronavirus and then spread it to someone else, and that more will be known about this likelihood “in some time, as we do some follow-up studies.” CDC Director Rochelle Walensky had been no more definitive on Meet the Press a few days before, where she told the host, “We don’t have a lot of data yet to inform exactly the question that you’re asking.”

In the middle of January, the deadliest month of the pandemic, one day after inauguration, the Biden administration put out a comprehensive national strategy for “beating COVID-19.” The 200-page document includes many useful goals, such as “Restore trust with the American people” and “Mount a safe, effective, and comprehensive vaccination campaign.” But nowhere does it give a quantitative threshold for when it will be time to say, “Okay, done—we’ve beaten the pandemic.”

A month later, it’s time to get specific. The facts are undeniable: The seven-day average of new cases in the United States has fallen by 74 percent since their January peak, hospitalizations have gone down by 58 percent, and deaths have dropped by 42 percent. Meanwhile, more than 60 million doses of vaccine have gone into American arms. At some point—maybe even some point relatively soon—the remaining emergency measures that were introduced in March 2020 will come to an end. But when, exactly, should that happen?