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TIL the genome of modern humans contains the DNA from four different hominid ancestors: homo sapiens, Neanderthals, Denisovans, and a fourth species that has yet to be discovered.

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9YoJm TIL about "exploding caskets" being a problem in mausoleums. The process of decay builds up gasses that can cause a literal explosion and knock down the marble front of a crypt.
DL0V TIL it is estimated that 40% of all humans to have ever been born did not live past their first birthday.
Jx9l TIL NASA scientists created a nanoscale vacuum tube that can potentially replace silicon transistors in future electronics
KeBQ TIL a study found that the costs of switching to clean energy from fossil fuels would be more than offset by the savings in reduced premature deaths from reduced air pollution
R5pAj TIL about Spring-heeled Jack, a figure of Victorian urban legend. He was known for making extraordinary leaps, having a devil-like appearance with clawed hands and eyes of fire, breathing blue flame and dressing as a gentleman.