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Today I learned about the Oh-My-God particle: an ultra-high-energy cosmic ray detected on 15 October 1991. As of 2023 it is the highest-energy cosmic ray ever observed and the time of its detection it was traveling at 0.9999999999999999999999951 times the speed of light.

Read more wikipedia.org

via reddit.com

M7OjW TIL about Grand Duke Travis I of Westarctica, the American man who has claimed the otherwise unclaimed part of Antarctica as his own territory
l7NYV TIL of the Boynton Bicycle Railroad. It was a monorail with two vertically aligned rails(one wooden), double decker passenger cars, propelled by steam engines that ran for two years in the 1890s in Brooklyn, New York.
je7R TIL there is a special seat in the US Senate known as the Candy Desk because it has a drawer full of sweets. The senator who sits there must stock it full of candy from their home state. It has been a tradition since the 1960s.
4kMoJ TIL the current fastest Wifi band (6GHz) already transmits, but most people can't access it. As of 2023, tech giants such has Apple only have 2 phones that support it.
b9Y8j TIL that more than half of the oxygen we breathe come from marine photosynthesizers like seaweed and phytoplankton.