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TIL people have composed music specifically for cats, and cats actually seem to like it.

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nWJod TIL Malignant Hyperthermia is a deadly reaction ( temp as high as 109 f ) to general anesthesia. It's inherited and runs in families. It's the reason anesthesiologists always ask you if anyone in the family had a fatal reaction to anesthesia.
9wx7G TIL Victorian poet Robert Browning believed that a "twat" was an item of clothing worn by nuns, and included an infamous line about "cowls and twats" in one of his poems. He came to this conclusion after misinterpreting a vulgar rhyme which mentioned "old nuns' twats".
R59ma TIL that the CIA's Directorate of Science & Technology created the lithium-ion battery in the mid 1960s and declassified it for public sector use
epda5 TIL a Challenger space shuttle engineer, Allan McDonald, raised safety concerns against the wishes of his employer & NASA. He was ignored; a fatal accident resulted. When McDonald spoke out, he was demoted by his company. Congress stepped in to help him. He later taught ethical decision making.
ML4K TIL that in WW1 only two nations did not execute their soldiers for desertion, the United States and Australia.