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TIL per passenger mile, Amtrak is 30–40 percent more energy-efficient than commercial airlines and automobiles overall

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yZDV TIL That you probably know what “huh” means no matter what language you speak
VMgrD TIL there are mysterious ancient stone cart tracks all over Malta, some of which disappear over cliffs and reappear at the bottom of the ocean.
WGeB TIL London has a ‘Cereal Cafe’ where you can eat hundreds of different kinds of cereals from around the world
rgpy TIL It has been calculated that due to time dilation, the core of the Earth is 2.5 years younger than the crust.
YpRvd TIL that in 1921, Frederick B. Banting figured out how to extract insulin from a dog’s pancreas, creating the first real treatment of diabetes. He intended to make it extremely cheap in order to save as many people as possible but private companies now charge almost $300 a single vial of insulin.