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TIL the eulachon is a type of fish also called the candlefish, because its body is so fatty during spawning that if caught, dried and strung on a wick, it can be burned as candle.

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neXl7 TIL To determine which movie characters best embodied psychopathic traits, forensic psychiatrist Samuel Leistedt and ten colleagues watched 400 movies over 3 years. Their winner: Anton Chigurh from "No Country for Old Men."
b9Aw4 TIL avocados evolved to be eaten whole by herbivore dinosaurs, who would then poop out the pit to a new location, spreading the trees; after dinosaur extinction, the plant narrowly hung on in a small part of Mesoamerica until humans discovered the fruit and started cultivating them widely
VMkwB TIL that when confronted by a rattlesnake, a California ground squirrel will direct blood to it’s tail to heat it up, causing the rattlesnake to back down because it distinguishes prey by sensing infrared radiation.
neaxo TIL about Smoky the Yorkie, a pet dog to soldiers in the south pacific, weighing 4lbs, who kept operational 40 United States fighters by running a wire tied to her collar through a 6in pipe, completing a 3 day construction job in minutes. Also had 10 recognized combat flights, 8 combat stars.
7adL TIL - Most of the smoke billowing up from a space shuttle launch is not exhaust. It is water vapor from the pool of water under the shuttle designed to absorb the acoustic shock waves that could otherwise tear the shuttle apart.