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TIL Ed O'Neil (Married With Children) is a Brazilian Jiu-JItsu Black Belt

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eprb6 TIL less humid air increases atmospheric pressure. Air is mostly nitrogen (78%) and oxygen (21%). Water vapor is less dense than air because hydrogen is lighter, so it displaces heavier gases, reducing air density and lowering pressure when humidity is high
W751o TIL archaeologists in Mexico discovered a huge, lost Mayan city, which they named Valeriana.Valeriana was discovered by chance thanks to Lidar, or Light Detection and Ranging, a technology that uses lasers to map and analyze archaeological landscapes.
VBADQ TIL Gaetan Dugas, supposed "Patient Zero" of the US AIDS epidemic, wasn't that, according to a 2016 genetic study. The "0" was originally letter "O" for "Out of California" in a 1984 study, and because he was more helpful in naming partners, there was likely also "ascertainment bias" in blaming him.
7roBx TIL that originally (up until 1804) electors could cast two votes for two different U.S. candidates for President, and the first runner-up presidential candidate became Vice President to guard against electoral gamesmanship.
Nv7E TIL that the story of the US army giving native Americans blankets laced with smallpox is a lie.