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TIL That “The Right of the First Night”, where a feudal lord had the right to be the first to bed the local wives, has no definitive evidence and might be a fabrication.

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v15Wj TIL that Edward Jenner discovered vacination by injecting puss from a milkmaid's cowpox sore into an eight-year-old boy and then attempting to infect him with smallpox six weeks later. The boy did not develop smallpox, indicating that the earlier exposure to cowpox protected him from infection.
nebyo TIL Benjamin Franklin was a popular author at 16 under the name Silence Dogood. The articles are written in the persona of a middle-aged woman and Franklin received several marriage proposals in the process. Franklin would slide these articles under the door of his brother's newspaper print shop.
pYArN TIL the world’s largest ETF, SPY, worth over $500 billion, is tied to the lives of 11 random people born between 1990 and 1993. None of them knew they were involved, but the fund will dissolve 20 years after the last one passes away.
OGVQR TIL CO2 bonds with the moisture in your nose creating carbonic acid. That's why it burns when you burp after drinking a soda.
WmwB TIL of Unit 731, a covert biological warfare research and development unit of the Japanese Army that undertook lethal human experimentation. A few of the experiments included vivisection without anesthesia and pressure chambers to see how much a human could take before his eyes popped out.