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TIL that whale songs can be used to map out the ocean floor, and the songs help to monitor earthquakes.

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RjL9 TIL of Pedro López, a child-murderer known as “The Monster of the Andes” and who is regarded as the most prolific serial killer of the 20th century. He has killed over 300 young girls across South America. He was released from captivity in 1998 and his current whereabouts are unknown.
AE5a TIL: Giraffes tongues are blue because when feeding, their tongues are frequently out of their mouths and exposed to sunlight, so the dark coloration serves to prevent them from getting sunburned.
PYx0G TIL Alice Lloyd College in Kentucky offers free tuition to students working at least 10 hours a week & free room and board to students working 15 hours per week
WkR4L TIL 'Margaritaville' Jimmy Buffett Song Named Most Profitable Song Ever
adO9 TIL the Riddler once forced Batman to perform a tracheotomy on a baby.