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TIL some Reptiles and Amphibians have orgies. Known as "mating balls," numerous individuals cluster together while engaging in sexual reproduction, for mutual warmth during cold weather.

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RwN8 TIL the USSR planted trees on battlefields instead of recovering fallen soldiers
epV4L Today I learned that Heinz invented the word “Ketchup” ~100 years ago; before, it was called “Catsup”
korB TIL that candles lit in microgravity (i.e., space) burn not with a yellow, tapered flame, but with a spherical, nearly invisible blue flame
gM5k8 TIL that in 1998, Sony released a camcorder with night vision so powerful it could see through people's clothes. Sony immediately issued a recall.
p8WrZ TIL that billionaire Warren Buffett still lives in the house he bought before he was rich, and still eats breakfast at McDonalds almost everyday.