The portable PCR testing booth dangled in the air over a dark Beijing street, captured on camera as it was winched away by a crane in the middle of the night. The image spread rapidly across Chinese social media, the perfect symbol of the bewilderingly rapid end of a draconian era. In the face of the most widespread national protests since the bloody crackdown on Tiananmen Square demonstrators in 1989, the Chinese government has abruptly abandoned its flagship zero-Covid policy. In Beijing, people prepared to go into shopping malls or on public transport without a recent negative test. Elsewhere, they...