(Technically, there are three variants of Covid-19 as well. The original, the UK variant and the Brazil variant.)
Filmmaker Ken Burns has spent his career documenting American history, and he always considered three major crises in the nation's past: the Civil War, the Depression and World War II.
Then came the unprecedented "perfect storm" of 2020 β and Burns thinks we may be living through America's fourth great crisis, and perhaps the worst one yet.
Heβs an extremely talented and insightful man. I thoroughly enjoyed his Vietnam series.