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TIL that by international agreement, a meter is defined as the length of the path travelled by light in vacuum during a time interval of ​1⁄299792458 second.

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wykJ TIL in 1975, Alaska legalized recreational Marijuana use, and it’s still legal today
neGOr TIL that in 1885, James Whitcomb Riley wrote and published a poem called "Little Orphant Allie", based on a little girl he had met named Alice (nicknamed Allie). Due to a typo in the published version, her name was misspelled as Little Orphan Annie, and this name became a much more famous character.
nWm79 TIL that local tax laws had a significant impact on automobile design, especially engine design, in different countries
DZBe TIL Scientology obtained their tax exemption from the IRS by having P.I.s dig into the personal lives of IRS managers and initiating hundreds of law suits against IRS employees. Eventually Scientology offered to drop all suits for religious tax exemption and the US government caved.
W7oyL TIL Canada was the first country to declare war on Japan in the Second World War