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TIL the "light bulb" in angler fish is generated by bioluminescent bacteria living within

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LklxV TIL: The release of a new Harry Potter book had such an impact that researchers in Oxford found that the admission rate of children with traumatic injuries to the city's emergency rooms plummeted on the publication weekends of both Order of the Phoenix and Half-Blood Prince.
JNBk TIL that the Parrot fish eat coral and poop sand and are responsible for many of the islands and beaches of the Caribbean.
WkKYN TIL Nile Crocodiles dig the deepest burrows of all known animals, up to 39 feet deep.
d768 TIL LGBT youth represent at least 20% of the homeless population in the US, with some estimates as high as 40%
O5j7 TIL that steam pianos used to exist, and they could be audible for miles.