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TIL that walruses are capable of whisteling

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Lk1Nv TIL the rarest blood type on Earth is RHnull with only 43 people reported on Earth with that blood type.
ADoPo TIL Star Trek's training exercise Kobayashi Maru has been used by computer security educators to teach students to think like an adversary, that by stepping outside the rules of the game one can redefine the game, and why you should teach your students to cheat.
aw6jM TIL that Tristan da Cunha, a British island in the Atlantic 2400 km away from the nearest continent, is a commune, where all land is communally owned and cattle numbers are restricted to discourage wealth accumulation.
Wke4B TIL Bette Midler named her chickens after the Kardashians. Kim Kardashian died of a yeast infection.
4Xyga TIL UFC1 had no weight classes and just 3 rules - no biting, eye gouging, or groin shots. There was no time limit and the winner, Royce Gracie, had to fight 3 guys in the same day on November 12, 1993, to win.