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TIL charcoal beetles fly into still-burning forest fires to mate and lay eggs because competition and predators will be low. They sense distant fires using infrared armpit sensors.

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W7DWX TIL Semmelweis (1818-1865) guessed the importance of asepsis to fight puerperal fever: he proposed to wash hands before visiting pregnant women. However, his colleagues didn't believe him because microbiology and germs were not yet discovered and Semmelweis couldn't prove definitely his theory.
epODJ TIL in the Karajá language, only women generally pronounce the sound /k/. With time, the extensive weakening of the /k/ sound became associated with masculinity while its preservation was seen as a sign of femininity. This is an example of a socially motivated phonological rule.
p8eJb TIL the training for the original The Matrix movie was so intense Hugo Weaving (Smith) needed hip surgery and Keanu Reeves (Neo) suffered a two-level fusion of his cervical spine which had begun to cause paralysis in his legs, requiring him to undergo neck surgery.
wZXP TIL that vast amount of high-paying engineering disciplines in the US are overwhelmingly dominated by men, while the not-so-lucrative humanity/social/education disciplines are very much dominated by women; this career self-selection is thought to be behind the male-female pay disparity.
dDZV7 TIL that production of North American Coral Snake anti-venom stopped in 2006, with existing stocks expiring in 2008. The FDA had approved the use of remaining supplies through 2019.