_March 11, 2020 Four years ago today, society began to shut down.

Shortly after noon Eastern on March 11, 2020, the World Health Organization declared Covid — or “the coronavirus,” then the more popular term — to be a global pandemic. Stocks plummeted in the afternoon. In the span of a single hour that night, President Donald Trump delivered an Oval Office address about Covid, Tom Hanks posted on Instagram that he had the virus and the N.B.A. announced it had canceled the rest of its season.

It was a Wednesday, and thousands of schools would shut by the end of the week. Workplaces closed, too. People washed their hands frequently and touched elbows instead of shaking hands (although the C.D.C. continued to discourage widespread mask wearing for several more weeks).

The worst pandemic in a century had begun._

Via the New York Times “The Morning” Newsletter ….