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TIL Rats laugh when tickled

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epE65 TIL that not a single human pheromone has been identified
8aWV TIL A mathematician called Paul Erdős used amphetamines to improve his work. A friend bet him $500 he couldn’t quit the amphetamines he for a month. Erdős won and then promptly resumed taking them after complaining it had delayed his mathematics work by a month.
Me7Om TIL the Oxford English Dictionary contains over 170,000 words in current use, whereas a vocabulary of just 3000 words provides coverage for around 95% of common texts. If you do the math, that's 1.75% of the total number of words in use.
oBppL TIL that when Apple released the LaserWriter printer in 1985 it had a built-in programming language, its own RAM and used the same CPU as the original Macintosh, but running at a higher speed. Because of this, the LaserWriter printer had the most processing power in Apple's product line at that time
0d6QR TIL of the "Honey War" of 1839, a bloodless conflict over the border between Missouri and Iowa, sparked by the cutting down of three honey trees.