The new year approaches. But what if you had to learn a completely new calendar for the coming year? For about a dozen years starting in the late 19th century, France abandoned the Gregorian calendar for an entirely different one.
Research:

Behind the Scenes Minis: Oh, Kropotkin!
17:28

Peter Kropotkin's Mutual Aid, Part 2
49:57

Peter Kropotkin's Mutual Aid, Part 1
45:03