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TIL about the Janzen–Connell hypothesis, a widely accepted mechanism that asserts that a forest with more diverse species of plants will prosper because the more common a plant species is, the more specialist enemies it attracts.

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5V0nQ TIL that the largest coprolite (fossilized poop) ever discovered is from a T-Rex. It's 67.5 cm long, weighs over 9 kg, and has been nicknamed "Barnum." It's on display at the Poozeum, which is an entire museum dedicated to dino droppings.
kOaE1 TIL of Sessue Hayakawa, a Japanese actor who was one of the biggest stars in 1910s Hollywood while being an early sex symbol. After growing tired of playing stereotyped roles he created his own production company, helping improve public opinion on Asians, while making a staggering $2 million a year.
8aM4X TIL in 1998, Disney helped create a copyright law that made sure no movies from 1923 became free to watch and distribute for 20 more years. This copyright law expires on January 1, 2019.
EgMZo TIL that octopuses have three hearts—two pump blood to the gills, while the third pumps it to the rest of the body. What's even crazier? The heart that pumps to the rest of the body actually stops beating when the octopus swims!
69l7 TIL The Jetsons only aired 3 seasons, the first in 1962 and the second and third in 1985-1987, over two decades later