The many anniversaries of the start of the pandemic

Recently, Lulu Garcia-Navarro, of NPR, asked her Twitter followers to share when and where they first realized that the coronavirus would upend all our lives, and tag their recollections using the hashtag #TheMoment. Responses poured in. “Pi Day,” a tweeter named Beth Ochsner wrote. “We always have a Pi Day party (March 14) and one of the friends we invited suggested that maybe, according to his information, gathering in a group right now was not advisable. I debated a bit but then cancelled...