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TIL that pearlfish will sometimes seek shelter in the anus of a sea cucumber. If the entrance is shut, the pearlfish will stick its tail in its mouth, cutting off its oxygen supply and forcing it to open its anus

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nWXQ7 TIL that internal combustion engines can run on wood. Using a device called a gasifier, the engine can run on the gasses produced when wood or charcoal burns.
JYLpj TIL the title of the novel "Twenty Thousand Leagues Under The Sea" does not refer to a depth. It refers to the distance covered by the Nautilus in immersion during its voyage. 20k leagues is around 80 000 km. The correct translation of the title is "... under the seas" making the distinction clearer
9wWoD TIL that construction of a border fort in New York State was abandoned by the US after realizing that it was mistakenly built on the Canadian side of the border. The fort was quickly dubbed 'Fort Blunder'.
mVZP TIL the cougar holds the Guinness record for the animal with the highest number of names, with over 40 in English alone.
WkOZX TIL that University College in London created a tube map showing the average life expectancy of those born near each train station. Some born just 1 stop apart had differences of over a decade.