evidence: What impresses, at least impresses a medical oncologist used to dealing with diseases that develop over years or decades, is the vital importance of timing when one shuts down a city or a country. Too soon, and the economic consequences are devastating. They are devastating even if done right on time, as the collapse of the world economy shows. But too late, and you get Philadelphia in 1918, or Milan or New York City or New Orleans in 2020. Looking at 1918's Philadelphia Victory Parade, and Mardi Gras in 2020, one can wonder how far we have actually come in learning the meaning of some Epi stories.