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TIL that the Darian calendar is a proposed system of time-keeping for Mars. The year is divided into 24 months of four weeks; each week has seven days: Sol Solis, Sol Lunae, Sol Martis, Sol Mercurii, Sol Jovis, Sol Veneris and Sol Saturni.

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XlBD TIL Pope Francis used to be a nightclub bouncer
VMp60 TIL Fat Bottom Girls and Bicycle Race by Queen were released together on a double A-sided single, and refer to each other. Near the end of Fat Bottomed Girls, Mercury shouts, "Get on your bikes and ride!" Bicycle Race reciprocates with the lyric "fat bottomed girls, they'll be riding today."
O0b6 TIL theres a light bulb powered by bacteria.
R4r8 TIL Harvard has a two semester math course that covers four years of material, has a +75% drop/fail rate, and is considered by many to be the most difficult undergraduate class in the country.
X0jlR TIL the U.S. pays the Cuban government $4,085 annually in rent for the 45-square-mile naval base at Guantanamo Bay. The U.S. has leased Guantanamo Bay from Cuba for more than 50 years. Cuba has refused to cash the checks because it hasn’t recognized the legitimacy of the lease.