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TIL That Sonar used by Naval ships is a billion times louder than a jet engine at 230db. Its also audible (in the water) for hundreds of miles, and is lethal when swimming underwater, even hundreds of feet away from the source.

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m1r6x TIL about Lyrall's Wren, a flightless songbird hunted to extinction by lighthouse keeper Lyrall's pet cat
GARk5 TIL of Fort Stevens, Oregon, the only military installation in the mainland US to be attacked during World War 2. A Japanese submarine surfaced off the coast and fired a volley of shells at the fort, which took no damage aside from the backstop of its baseball field.
xYL5 TIL the Energizer Bunny ad campaign did not lead to increased sales. In fact, Energizer’s sales fell. It is speculated consumers associated the bunny with Duracell batteries and purchased them instead.
0L1p TIL the word myriad means 10,000, but it can also mean a generically large number. It’s also okay to say “there’s myriad cats” or “there’s a myriad of cats”
78OGr TIL the Sheena Easton hit song 9 to 5 was released in the United States under the alternate title of Morning Train. This is because three months prior Dolly Parton had a hit song in the USA that was also called 9 to 5