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One cartographer has done the heavy lifting, and rail fans are pumped.

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wLQRP TIL Franklin Delano Roosevelt (the 32nd president) is related to the most other U.S. Presidents with a total of 11; 5 by blood and 6 by marriage. Notable mentions are George Washington, Ulysses S. Grant, and James Madison.
DX0g TIL the first black president in North America was Vicente Guerrero, the second president of the Republic of Mexico in 1829. He is known for abolishing slavery in Mexico forty years before Lincoln would do the same on the US.
ep46D TIL that neurotransmitters were discovered in 1921 by Otto Loewi after an idea for the experiment which proved their existence occurred to him in a dream.
Z8dlB TIL That in 2003, famous skateboarder Rodney Mullen's right femur and hip began to fuse together. Doctors were wary of treatment, so Mullen used homemade instruments to attack the scar tissue and eventually one night, while twisting himself within the wheelwell of his truck, broke free.
Jldj TIL that Hitler’s plan for moscow after capturing it during WW2 was to kill all its residents and replace it with a lake