On April 8, 2020, the Chinese government lifted its lockdown of Wuhan. It had lasted 76 days — two and a half months during which no one was allowed to leave this industrial city of 11 million people, or even leave their homes. Until the Chinese government deployed this tactic, a strict batten-down-the-hatches approach had never been used before to combat a pandemic. Yes, for centuries infected people had been quarantined in their homes, where they would either recover or die. But that was very different from locking down an entire city; the World Health Organization called it “unprecedented in public health history.”