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TIL 80% of all marriages in history are between second cousins or closer

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oR78 TIL that a history teacher in the 1960s ran an experiment to recreate Nazi Germany using his students, called the “Third Wave.” The students had hung banners around the school, saluted each other in the hallways, and his skipped other classes to join the movement.
EgWZx TIL that every living former President of the South Korea has served, or is currently serving, a prison sentence.
oBPvR TIL that in post-Soviet Russia, feral dogs have learned to commute on the subway to broaden their food scavenging range - including getting to know which stops they are looking for based on the announcements over the PA.
QJMoE TIL that in 1975 a cat was credited as a co-author of a physics paper, after Jack Hetherington accidentally used articles such as "we" and "our" in a study on atomic behavior. Unwilling to change the errors, he simply added his cat as a co-author, under the name "F.D.C. Willard"
JYgxB TIL Hugh Jackman never knew wolverines were real animals; he mistakenly studied wolves in preparation for the iconic super hero role.