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TIL of Tsujigiri or 'crossroad killing' the practice whereby a Samurai would test the sharpness of a new katana by attacking a random passerby.

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rRDby TIL Ken & Barbie were originally modeled after their founder's children. So Ken & Barbie were kind of...siblings.
rr01 TIL that astrophysicist Carl Sagan and his wife would smuggle books about the history of the Russian Revolution into the USSR so that their colleagues could read them, since recorded history lessons in Russia were actively manipulated by Joseph Stalin at the time.
KYY4J TIL Thomas Jefferson's grandson was a Confederate general during the Civil War
lka TIL that two stars of Whose Line is it anyway (Wayne and Colin) are making a new show
rR6Oy TIL of Canada's "Apology Act" to allow habitually apologetic Canadians to say "sorry" without implying any admission of fault or liability.