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TIL David Letterman's NBC show was originally a Daytime talk show

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mpMp TIL that “Horseback riding carries a higher injury rate than motorcycle riding.”
LkWDd TIL in World War II, a few engineers wanted to reinforce the (returned) fighter planes where most of the bullet holes were. Mr. Abraham Wald then said: Let's reinforce them where no bullet holes are instead - because apparently, airplanes hit in these spots did NOT return.
neDxY TIL Shouting FIRE! in a crowded theater isn’t illegal. In U.S. v. Schenck, SCOTUS decided a pamphlet opposing the draft in WWI posed a "clear and present danger" to a nation at war. But it was overturned 40 years later.
X0njE TIL about James Harrison - a blood donor in Australia whose plasma contains antibodies for Rhesus disease. His donations over 60 years have saved over 2 million babies.
694Qm TIL scientists discovered a “dinosaur disco”, more than 100 tracks made by giant, long-necked dinosaurs, brontosaurs and brachiosaurs on a small shore on the Isle of Skye