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TIL that there is enough DNA in the average person’s body to stretch from the Sun to Pluto and back — 17 times

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via reddit.com

ZKGQ TIL the Tempest Prognosticator was a device that kept 12 leeches inside small bottles. They attempted to climb out of the bottles when a storm was approaching, causing a bell to ring. The number of times the bell was struck indicated the likelihood of a storm.
rR8Zw TIL that the marital difficulties of Marie Antoinette and Louis XVI were due to her exceptionally narrow vagina and his overlarge penis; both Habsburg and Bourbon elites discussed the problem in detail
jMPv TIL of Dragonskin a new generation of body armor. In one test this armor was shot by 150 rounds of various calibers of bullets including steel core rounds. It took a grenade at point blank range to damage the armor and yet was not enough to break through.
AD4Pl TIL Betty White had a cameo in Toy Story 4 as a teething toy named “Bitey White”
vxmR TIL that mandatory right-hand traffic was introduced in Europe by Napoleon with the aim of deterring swordfighting on horseback, and because the traditional left-hand traffic was seen as aristocratic. Since he never conquered Britain, left-hand driving would remain there.