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TIL the US Navy has a Marine Mammal Program which trains bottlenose dolphins and California sea lions to detect, locate, mark and recover objects in harbors, coastal areas, and at depth in the open sea.

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via reddit.com

VM060 TIL The USS Niagara was intentionally sunk in 1820 for preservation, and raised 93 years later for restoration.
oJ1R TIL Louis Braille, inventor of the system of reading and writing for use by the blind or visually impaired, created the raised-dot system by using an awl, the same kind of implement which had blinded him at the age of three.
OoXK4 TIL that falcons are more closely related to parrots and songbirds than they are to hawks.
WxWd TIL Three of the greatest reggae artists ever – Bob Marley, Peter Tosh and Bunny Wailer – met while working at a Chrysler Factory before any of them had even started their musical careers
mxBGo TIL about crossed letters, they consist of two different sets of writing, one written horizontally and the other perpendicularly. This was done during the early days of the postal system in the 19th century to save on expensive postage charges and to save paper.