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TIL goldfish have a memory span of at least three months, can recognize their owners, and can be trained to do tricks. Goldfish can also see ultraviolet in addition to red, green, and blue making them tetrachromats.

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kE7E TIL that 27 million Soviet citizens died in WWII. By comparison, 1.3 million Americans have died as a result of war since 1775.
ne68d TIL in 1969 , a piece of fecal matter escaped containment and was found floating around the cabin of Apollo 10. The whole crew denied it was theirs.
j6M4p TIL the Hawaiian bobtail squid feeds a symbiotic bacteria living inside of it (called Vibrio fischeri) sugar & amino acids. In exchange, the bacteria emanate just enough light to match the moon's rays, rendering the squid virtually invisible at night
E165V TIL an alcoholic court stenographer in Manhattan repeatedly typed I hate my job instead of documenting speech during cases
d7d9 TIL The day the Secret Service was created by Abraham Lincoln, April 15, 1865, was also the day he was assassinated by John Wilkes Booth.