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TIL snake venom contains proteins that change the odor of the wounded animal, allowing snakes to track their bitten prey by odor. This adaptation allowed rattlesnakes to evolve the strike-and-release bite mechanism, which provided a huge benefit by minimizing contact with potentially dangerous prey.

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gM54A TIL of Gus the Central Park Zoo Polar Bear (1985-2013). Reporters dubbed him "neurotic", "depressed", "flaky", and "bipolar" turning him into a "symbol of the stress of living in New York City". As part of his therapy and treatment, Gus was the first zoo animal in history to be treated with Prozac.
5YynP TIL the data connection between the ISS and other modules is just plain old ethernet via the International Docking System Standard connector (page 73)
PYr9Z TIL the National Association for Rational Sex Offender Legislation exists, which argues for fair and balanced sentencing due to the spectrum of sex offense severity.
wo6po TIL in 1714, a Native American guide in eastern North America showed a group of settlers a deep path worn in the streambank by herds of eastern elk crossing the river. By 1880, the U.S. Fish and Wildlife Service declared the eastern elk subspecies extinct.
KOraB TIL If you are using a plastic kettle to boil water for your coffee or tea, then you are exposing yourself to endocrine disrupting chemicals such Bisphenol A (BPA) or Phthalates. Phthalates can leave a slight change of flavour or odour