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TIL that cheetahs were nearly exhausted by the last ice-age, and all modern cheetahs are descended from a small portion of the surviving cats that interbred to maintain their species. Due to this, cheetahs are almost genetic clones of one another.

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kvDE TIL There is an old soviet scientific research hut buried 20 ft. under snow in one of the most inaccessible places in Antarctica. If you can make it in the hut there is a visitors book you can sign.
nejD9 TIL That a Southwest Airlines Pilot once held a plane for 12 minutes, to allow a man to see his dying 2 year old Grandson for one last time.
4XxNg TIL Zombie fires are wildfires that can smolder underground through Arctic winters, reigniting at the surface when conditions are right.
l79p5 TIL that in 2007 BBC journalist Alan Yentob was caught out for having clips of himself nodding inserted into interviews on a TV show he fronted to make it appear that he had conducted them instead of other journalists
QM9L TIL A 1.91TB file is available for download that contains PI to 5 trillion decimal places