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TIL Mars has two speeds of sound. Lower-pitched sounds travel more slowly on Mars than higher-pitched ones.

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Br1mW TIL accents in the UK change noticeably every 25 miles. Many British people have admitted that they change their accent dependent on the situation they are in.
J1dvB TIL About Kriegsnagelung or war nails. A fund raising system in WW1 where you paid to drive a nail into a statue. There were hundreds of these and I had never heard of them. Found one in a castle I visited this weekend.
MeKM7 TIL Xerox and Cannon created the Machine Identification Code. A digital watermark which certain color laser printers and copiers leave on every single printed page, allowing identification of the device with which a document was printed and giving clues to the originator
jNpln TIL The NYPD has a beekeeping unit with 2 full time officers whose job it is to focus solely on any issues related to bees in the city.
oEEo TIL in 1995 Dave Grohl was offered the opportunity to be a full-time, permanent drummer for Tom Petty and the Heartbreakers. Dave turned down the offer to pursue the Foo Fighters instead.