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TIL that heroin was first mass-produced by the pharmaceutical company Bayer in 1897. From 1898 to 1910 heroin was marketed as a non-addictive morphine substitute and cough medicine for children.

9X1X TIL that in Detroit in the 1930s, a baby fell from a high window and landed on a man who was passing the street below. The baby and the man both survived the incident. A year later, the SAME baby fell from the SAME window and landed on the SAME man, and they both survived.
MeaYb TIL there are two competing symbols of medicine in the US: the Rod of Asclepius (a staff with a single snake coiled around it) and the Caduceus (with two snakes and a pair of wings). The two are completely unrelated ancient symbols.
nW06P TIL Tobey Maguire expressed concerns about his back problems preventing him from starring in Spider-Man 2, but when the studio secured Jake Gyllenhaal to replace him, Maguire recovered, and the sequel was shot without Gyllenhaal. Both actors later starred together in Brothers (2009).
KOpba TIL that ferrets don't exist in the wild; they're the domesticated form of the European polecat, and America's "black-footed ferret" is, in fact, actually a species of polecat.
N76k8 TIL about Maj. Walter Reed (Walter Reed Medical Center is named for him) who was a major influence in the fields of epidemiology and bio-medicine. With a fellow doctor from Cuba he discovered that yellow fever was transmitted via mosquitoes and not human to human transmission saving countless lives.