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TIL in Canada, December 6th is known as White Ribbon Day. It is the anniversary of the 1989 École Polytechnique massacre, in which armed student Marc Lépine murdered 14 female engineering students and injured 14 other people.

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QN4wL TIL that from 1925 to 1939, a group of corporations called the Phoebus cartel, including General Electric and Philips, coordinated competition among lightbulb manufacturers. To drive repeat sales, they fined companies which produced lightbulbs with an average lifespan exceeding 1,000 hours.
j6wGQ TIL that the My Little Pony: Friendship/Fallout fusion fanfiction Fallout Equestria doesn't just have physical editions, but the third edition is in the catalog of the Library of Congress.
kOyj4 TIL of the Truth about Hansel and Gretel - a book that purportedly uncovered the origins of the myth: a baker named Hans Metzler and his sister Gretel killed an old woman for her recipe for gingerbread. Wildly popular, the book was soon discovered to be a hoax
X06bQ TIL: contrary to common belief, bees are not the only species to make honey. One wasp species does also
AWx4 TIL that Ignaz Philipp Semmelweis dropped the mortality rate for childbirth from 12% to 2% after he insisted doctors wash their hands in between handling cadavers and delivering babies.