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TIL pikas (real-life pikachus) are adorable mammals from the mountains of the American West. They can overheat in temperatures as low as 75 degrees F, so they make specialized dens to stay cool even when 900 degree F fires roar just a few feet away.

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BrxGr TIL that there is a specific order to Adjectives for the English language. Native speakers can just tell if it sounds right or not, and it may not be apparent to non-native speakers at first - in general the order is: opinion, size, age / shape, color, origin, material, purpose.
LVb0 TIL there is a punctuation mark that exists for the purpose of expressing irony.
xv1w TIL the flavour “Blackcurrant” is largely unknown to people in The United States, due to a ban on the berry in the early 1900s.
l0x1 TIL that India is credited with being one of the first civilizations to inoculate their children in times of pestilence to boost immunity and stop the spread of disease (1,000 years ago). They made a small incision into the child’s arm, then rubbed it with Smallpox scabs and a thin cloth.
NP6 TIL that a Pistol Shrimp can vaporize water with its claws, and for an instant that bubble is as hot as the sun - YouTube