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TIL in 1372 when architect Yi Kaizhan was commisioned to build the Jiayuguan fort, a pass along the Great Wall, he ordered the exact number of bricks required. He added one more when his judgement was questioned. The extra brick was never used.

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e0nPg TIL that according to legend, Thomas Urquhart, the Scottish aristocrat and polymath, laughed himself to death upon hearing that Charles II had taken the throne.
9YxA6 TIL James Howard. WW2 P-51 Mustang fighter pilot who defended his bombers, alone, against 30 Luftwaffe planes, even diving on them when he'd run out of ammunition, until they were driven away.
kOw05 TIL about Dr John L. Leal, the man responsible for popularizing chlorine in our drinking water, and saving countless lives by doing so
m1EWy TIL of Regina-Style Pizza, which is much denser than Chicago's Deep-Dish Pizza and is cut into squares.
wLkO6 TIL - There's a group of bikers that come to funerals of fallen soldiers to place their bikes and themselves between grieving families and the religious nuts who protest their funerals: The Patriot Guard