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TIL: That Mount Vernon the family home of George Washington, the first President of the United States, has always been open to the public. A tradition started by George Washington himself in the 1700s.

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QJGJM TIL that the largest cavalry charge in history occurred during the 1683 Turkish siege of Vienna. The Polish king led 18,000 German and Polish Cavalry in a charge that broke the Ottomans line and won the battle. The king paraphrased caesar, saying "I came, I saw, God conquered"
5WBp TIL that preventing an abort of the Apollo 11 mission has been attributed to the work of Margaret Hamilton, the lead flight software designer for Project Apollo. She was 31 when the lunar module landed on the moon, running her code, and is credited for coining the term “software engineering.”
pYwRA TIL that coal, solar, and wind's combined capacity factor (actual electrical energy output over time when compared to theoretical output) is merely 8% better than just nuclear energy's capacity factor (92.5%).
p8AY8 TIL about the largest known structure in the observable universe - Hercules–Corona Borealis Great Wall. It's approximately 10 billion light years in length, more than double the previous record holder, or 9.3% of the observable universe's diameter.
rkXy TIL German was the second most widely spoken language in the USA, until it was forcibly suppressed during WWI. The declaration of Independence in 1776 was even published in German first and only published in English a day later.