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TIL that the most difficult math course in the world is simply called Math 55. It is so challenging that in 1970, of the 75 students that enrolled in the class, 55 dropped out. Bill Gates is one of the more prominent alumni to have passed the class.

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r9A0 TIL That in March Bill Gates offered a $100,000 grant through his foundation for a condom design that “significantly preserves or enhances pleasure” to encourgae more males to use condoms.
JYLl1 TIL about the world's roundest object intended for re-defining exactly one kilogram by counting the number of silicon-28 atoms that forms it and redefining the Avogadro's number
oBN8R TIL in Helena Montana, a woman cannot dance on a table in a saloon or bar unless she is wearing at least three pounds, two ounces of clothing.
dDaeK TIL that the Pythagorean theorem must have been known before Pythagoras, because it is used in a proof on a Babylonian clay tablet dated about 12 centuries before the birth of Pythagoras.
9X6p TIL that in in the 1970s professional 10 pin bowlers made twice as much as NFL players.