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TIL of radiosynthesis, a process like photosynthesis that uses the pigment melanin to convert gamma radiation into chemical energy for growth. Radiotrophic fungi were discovered in 1991 in and around Chernobyl Nuclear Power Plant.

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rRPPw TIL lactose tolerance is a genetic mutation where a cytosine (C) nucleotide in a person's DNA is replaced with a thymine (T) nucleotide allows them to digest milk, not the other way around.
ADrgx TIL Croatian defender Josip Šimunić received three yellow cards in the match against Australia during the 2006 World Cup.Referee Graham Poll later revealed that upon booking Šimunić for the second time, he had erroneously recorded him as "Australia #3", due to Šimunić's Australian accent.
J1Qrl TIL the 1922 World Series featured two teams that shared a home stadium, brothers playing against each other, and the last tie in World Series history
nj7W TIL that scientists don’t know why hot water freezes faster than cold water, and earlier this year The Royal Society of Chemistry offered £1,000 for a member of the public to come up with a convincing explanation for the phenomenon.
mxGoR TIL of the "Hedonic Treadmill" - the tendency of humans to quickly return to a relatively stable level of happiness despite major positive or negative life events