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TIL The largest octopus species in the world, the giant Pacific octopus, has three hearts, nine brains, and blue blood.

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d8D8 TIL hemophilia is prominent in European royalty, because royal families engaged in copious amounts of incest, spreading the hemophilia gene
v17eK TIL If Holly (Ilex aquifolium) finds its leaves are being nibbled by deer, it switches genes on to make them spiky when they regrow. So on taller Holly trees, the upper leaves (which are out of reach) have smooth edges, while the lower leaves are prickly
kONmB TIL that Mikhail Gorbachev is still alive
N7OoN TIL that DMX has 15 kids
Yp8gG TIL In the 1990s, an issue of the popular The Amazing Spider-Man that sold around 70,000 would be considered a failure. These days, what counts as a successful superhero book is anything that can sell a regular 40-60,000 copies. Most sell quite a bit less.