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TIL Abraham Lincoln's assassination helped to popularize travel by train due to the amount of press and exposure Lincoln's funeral train received. Up until then, most Americans had never seen a passenger train.

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R5w8 TIL blood appears green if you’re deep enough underwater
mxRvv TIL in 1996 NBA star Mahmud Abdul Rauf refused to stand for the national anthem. His career ended as a result.
eegD TIL Dolphins can see our skeletons and heartbeats via their sonar and have even been known to ward off sharks preying on humans.
W7xvL TIL Dr. Hawley Crippen was tried & executed for killing his wife, in 1910, on the evidence her alleged remains were found in their house. A century later, DNA testing done on the remains proved they were not hers, had no genetic relation, and were male.
ndNP TIL: Glaucus, a members of the nudibranch family which are commonly referred to as sea slugs, can use the stinging cells from their prey as a defense mechanism. It does this by passing them from its gut to the surface of its skin.