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TIL that the coat of arms of House of Colleoni depicted three pairs of human testicles. The progenitor of the family was reportedly proud of this coat of arms which he displayed prominently.

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7r49b TIL that pop culture gargoyles have been used to repair and replace decaying carvings on cathedrals, including the Washington National Cathedral in Washington, D.C., which added a bust of Darth Vader in the 1980s, the contest-winning entry from Christopher Rader, a 13-year-old kid from Nebraska.
b9kwa TIL Isaac Newton once inserted a large sewing needle "betwixt my eye and bone as neare to [the] backside of my eye as I could", to observe its effect on vision
6kmZ TIL of James “Shanghai” Kelly, who in the 1800s kidnapped men and forced them to work on ships. One year on his birthday he announced he was hosting a free “booze cruise” to celebrate, served opium-laced whiskey to the attendees, then offloaded them onto waiting ships and got 100 men in one night
ZpV1Y TIL the first true reservoir was built on the Nile.
Lkymv TIL Heart cancer is not as common as other kinds of cancer because heart cells do not often undergo cell division, which reduces the chances of mutations that might ultimately lead to cancer.