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TIL screwworm, a nasty parasite that can kill hosts used to be common in southern USA and Mexico. Program in place for several decades have virtually eliminated all screwworm all the way to Panama/Colombia border

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9WY6 TIL A mantis shrimp (2-5 inches big) was provoked by a researcher, and the animal punched its aquarium wall, shattering the glass and flooding the office. Turns out the mantis shrimp’s punch is so fast, it boils the water around it when delivered.
loV4K TIL In 2004, Burger King held a "cockfight" to determine which of their chicken sandwiches was superior - it aired once on DirecTV
wLPg8 TIL that in 2001, the Parents and Friends of Lesbians and Gays (PFLAG) distributed fake $3 bills to be dropped in Salvation Army buckets in protest of their policy against benefits for LGBT couples. Hundreds were received in Seattle.
yQw5p TIL that E is the most used letter in the English language, at 13%, and Z is the least used, at 0.074%
WKrA TIL that the CPU of the Game Boy Color ran at 4.19 MHz. In comparison, a modern day i7 7700k desktop processor runs at 4.2 GHz.