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TIL about Kosher Switch, a light switch that complies with the Sabbath commandment by only working sometimes and hence doesn't count as intentionally lighting a fire

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xVAew TIL that humans can have far more chromosomal variation than just XX or XY. Some possible combinations include XXXXY, XXYY, and XXXXX. Also, the XYY condition, in which males have an extra Y chromosome, is often undiagnosed because there are so few symptoms.
gMbDD TIL Contrary to what they tell you in Hollywood movies, Secret Service agents do not swear an oath to lay down their life for the President. However, they’re trained to protect the president at all times, and if that involves taking a bullet, so be it
Am5g TIL of Wisdom, a 64 year old Albatross, who has flown over three million miles since being tagged, continues to lay eggs and, despite belonging to a monogamous species, has more than likely had to find a new mate due to her unusual longevity.
BgKay TIL Throughout recorded history, a wild orca has never killed a human, even though they are capable of ending even a greath white shark. Captive orcas have however have killed 4 people, out of which 3 were done by the same specimen.
rN5BW TIL that only Australians do the dance to Tina Turner's Nutbush City Limits.