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TIL the kilogram is currently defined as the mass of a platinum-iridium cylinder called the International Prototype Kilogram, which was made in 1879 and is stored in a special vault in France. There exist several dozen official replicas, also called prototypes.

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vvvD TIL When an airplane is at a precise angle between the sun and a bank of clouds, a circular rainbow known as a “Pilot’s Halo” forms around its shadow on the cloud bank.
WkjYX TIL that four months before his infamous match against Billie Jean King, 55-year old Bobby Riggs played against the top-ranked female tennis player at the time, Margaret Court. He won easily in straight sets: 6-2, 6-1
0wO4L TIL that cockroaches represent rebirth and resistance as a spirit animal.
e0eME TIL The saw used to cut off a cast cannot cut human skin. The saw vibrates rather than rotating which can be absorbed by the skin but splits the cast.
Z8JEo TIL there is a small strip of land in North Carolina which is officially British. This small cemetery is the burial place of several soldiers killed in World War 2. It flies the British flag, and the 'forever lease' states that it is British land.