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TIL telephone companies created the phenomenon of 555 telephone numbers in movies and TV shows, and 555-0100 through 555-0199 are still held back from the the public for "fictional use"

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8a4EZ TIL that a dog’s age is not 7 times human age, but: 16(ln(dog’s age))+31. It’s a natural logarithmic curve, so a 1-year old dog is about 31 in human years, and a 10-year old is about 68. (Link has calculator!)
nWmQB TIL of US Secret Service special agent Jerry Parr, who helped save the life of Ronald Reagan after an assassination attempt. As a boy, Parr saw Reagan portray a Secret Service agent in 1939's "Code of the Secret Service" and was inspired to become an agent himself.
BrjLk TIL: Dandelions are called "pissenlit" in French, which means "piss the bed" because the tea made from their roots is a powerful diuretic
6E00l TIL the Sovient Union developed a nuclear weapon so power that not even they were willing to test it at full capacity. The Tsar Bomba was the largest nuclear bomb ever tested in the earth's atmosphere, having a mushroom cloud spanning over 40 miles (64km) and a yield of 57 million tons of TNT.
4XgL5 TIL the Hawaiian Pizza was invented in Canada, and is the most popular pizza in Australia, accounting for 15% of pizza sales.