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TIL that the line "You gotta keep 'em separated" in The Offspring's song "Come Out and Play" came from when singer Dexter Holland worked in a biology lab. He had two steaming flasks of liquid that weren't cooling off when placed next to each other, so he thought, "I've got to keep 'em separated."

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VBA5p TIL: In Italy, c. 1500 AD – c. 1700 AD, males (mainly before the age of 9 years) destined to be castrati singers underwent castration by either having their spermatic cords severed or their testis crushed with the fingers as to retain the higher voice register necessary for their operatic part.
WMo4 TIL Aristotle believed the heart provided the ability to think, and the brain was just a heat sink for the heart.
E1nLP TIL of Mohamed Bzeek, a Libyan-born Muslim living in Azusa, California, a foster father who takes in only terminally ill children. Bzeek, who has been fostering such children since 1989, is the only foster parent in Los Angeles County who will do this.
9wdmp TIL Rats, gerbils, mice, birds, fish, monkeys, and chimpanzees all prefer making an effort to obtain their food over having it provided for free. Of all the studied animals, only cats did not display the behaviour, preferring to be served.
eeLb TIL lemon extract can contain up to 85% alcohol and can be purchased by anyone of any age in the U.S.