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TIL at least 15 species and genera have been named in Sir David Attenborough's honour. In 2018, a new species of phytoplankton was named after the Blue Planet documentary, which Attenborough narrated.

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OKe4 TIL that research indicates black americans really do tip waiters less than whites americans, but likely as part of a cycle: waiters resist serving African Americans, or they provide poorer service, which discourages blacks from patronizing table-service restaurants.
GY8v5 TIL in his book, tennis player Novak Djokovic said in 2010 he met with a nutritionist who asked him to hold a piece of bread in his left hand while he pressed down on his right arm. Djokovic claims he was much weaker while holding the bread, citing this as evidence of gluten intolerance.
6Eo9Y TIL the real Rosie the Riveter was still alive until recently
R5N4Q TIL that until the early 1920s, most astronomers thought that the Milky Way contained all the stars in the Universe. Following the 1920 Great Debate between the astronomers Harlow Shapley and Heber Doust Curtis, observations by Edwin Hubble showed that the Milky Way is just one of many galaxies.
KyMw TIL that in Biblical times, to swear a most sacred oath, the swearer made his oath by holding on to the oath-giver’s genitals.