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TIL that of the about 5400 species of mammals on earth, only female humans have permanent breasts

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9Ypy7 TIL Daniel David Palmer, the father of chiropractic maintained the notion and basic principles of chiropractic treatment were passed along to him during a seance by a long dead doctor. Before learning of spinal adjustment from a supernatural entity, he was also a magnetic healer.
AkOg TIL that during World War II, over 1,000 American airmen were shot down behind enemy lines and rescued by Yugoslavian Partisans and Serbian Chetniks.
ne7kr TIL The term "rocket-propelled grenade", though frequently encountered, is a backronym of the "RPG" from the translation of Ручной Противотанковый Гранатомёт (Ruchnoy Protivotankoviy Granatomyot) Russian for "handheld anti-tank grenade launcher" and not based on a true literal translation.
Ypg77 TIL that the impossible-to-remove-cleanly foil seal on medication bottles was developed because someone poisoned 7 people by adding cyanide to Tylenol bottles in Chicago drug stores in 1982.
W70GX TIL that Canada produces over half of the world's lentils.