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TIL that a rock is composed of two or more minerals, while a mineral is composed of the same substance throughout.

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epd1k TIL that the rapper Puff Daddy co-headlined an AIDS fundraiser following a charity basketball game at the City College of New York with fellow rapper Heavy D that ended up getting oversold and resulted in a crowd crush that killed 9 people and injured 29.
lxkA TIL a radioactive 1950s science kit for kids “came with four different types of uranium ore, a geiger counter, a miniature cloud chamber, an electroscope, a spinthariscope and an educational comic book called ‘Learn How Dagwood Splits the Atom!’”
OoMZL TIL about a dialect quiz that attempts to figure out where you grew up in the United States. It asks 25 multiple choices questions asking things like “what do you call a sweetened carbonated beverage?”. It then will try to triangulate where you are from.
KA9w TIL that Roger Ebert wrote three movies, Beyond the Valley of the Dolls, Up! and Beyond the Valley of the Ultra-Vixens. All skin flicks,
nWgN7 TIL of "Superman vs. Muhammad Ali", a 1978 issue of Superman where Superman and Ali are forced to fight eachother in a boxing match in order to repel an alien invasion. Ali won the fight