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TIL The oldest musical instrument in the world, a 60,000-year-old Neanderthal flute, is made from the left thighbone of a young cave bear.

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via reddit.com

4kBab TIL tha in the United States, peanut butter must contain at least 90% peanuts. If it contains less than 90% peanuts, it must be labeled as 'peanut spread'.
OoGW1 TIL a Czech brewery uses crayfish to ensure the purity of its water supply. The crayfish are fitted with tiny sensors which monitor heart rate and movement to detect when the animals react to impurities in the water.
yVAVJ TIL erections were believed to be caused by inflation so flatulence causing foods were an impotence cure
NXPa1 TIL not only does water only block 20% of UV rays with 3 feet of depth, but also the water surface reflects UV rays so being around water increases UV exposure
ZpvEB TIL there is an alligator at Gatorland in FL missing half its top jaw. After rehab they named her Jawlene as a nod to Dolly Parton and she is thriving!