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TIL that in Spearfish, South Dakota on January 22, 1943 at 7:30 am, it was -4 °F, then two minutes later, the temperature rose up to 45 °F. This is the fastest temperature change ever.

mxKlO TIL Dr. Robert Lopez, a vet, suspected a connection between cat ear mites and a child's rash, experimenting by transferring them into his left ear. "I heard scratching sounds... as the mites began to explore my ear canal." He repeated the experiment twice, and won the Ig Nobel Prize in entomology.
epgOn TIL in 2010 a two-tonne hippo escaped from a Montenegro zoo during a flood. After wandering around nearby farms for 10 days, she returned to her pen on her own accord. Her keepers had been keeping a close eye on her, giving her food when she came close to the zoo & covering her with hay at night.
xXK7 TIL on December 1, 1948, a dead man bearing no identification was found on an Australian beach. Well dressed in clothes with deliberately torn-out labels, in excellent physical condition, and having left behind a rare book containing a bizarre code, the man remains unidentified to this day.
QYgL TIL two different men disappeared in Naples, Florida one year apart. Both were last seen being arrested by the same officer. Neither of them were officially ‘booked’ as the officer told investigators he dropped them both off at gas stations. Their bodies have never been found.
BrAQk TIL that hippos, despite their large shape and short legs, can run at a maximum speed of 30 mph (48 kmph). Essentially outrunning humans.