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TIL that Ethiopia has 13 months to a year, and is still living in 2005

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b9p6a TIL Mathematician Leonard Euler was so prolific and original that some of his discoveries have been named after the first person to have proved it after Euler
rRd7M TIL that the world's first mental health hospital was built in Baghdad, Iraq in 705 AD. While mental health patients were being condemned, punished, and even burned in Europe, 8th and 9th century mental health patients in Iraq, Egypt, and Syria were given more proper hospitalization and treatment.
QNGGa TIL about the "Infernal Machine", a 25-barreled gun that the Corsican revolutionary Giuseppe Fieschi tried to assassinate King Louis Phillippe I with in 1835. The device killed 18 people in a single volley and injured 22 (as well as Fieschi himself), but only mildly grazed the King.
R5jl8 TIL the density of Phobos, the larger and closer moon of Mars, suggests 25-35% of its volume is empty space
4MKo TIL that Franklin Roosevelt was the first sitting US president to ride aboard an airplane, over 40 years after its invention.