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TIL that cheetahs were almost wiped out 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. Because of this, cheetahs are practically genetic clones of one another.

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JYxNk TIL, the Demilitarized Zone between North and South Korea is a wildlife haven. While most natural wildlife and rare plants have been killed off in the South, the DMZ hasn’t been touched in over 60 years, which resulted in unique species of flora and fauna to flourish in this area.
WEDd TIL skyscrapers in downtown Toronto are air conditioned via frigid water pumped from the bottom of Lake Ontario, reducing electricity costs by 75%
vPLLR TIL that migratory birds may use quantum mechanics to navigate via magnetic fields
VEJk TIL the creator of WinRar, Ron Dwight, passed away in 2002.
PYWxL TIL - Victor Lustig, a German con artist, designed and sold a "money box" which he claimed could print $100 bills. A victim, sensing profits, would buy the machine for a high price. Stocked with six to nine genuine $100 bills for demonstration purposes, but after that it produced only blank paper.