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TIL between 1972 and 2018 the world population has doubled to nearly 8 billion, there were only 2.6 billion people in the world in 1951.

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kO0em TIL that the Chinese equivalent of "when pigs fly" is "when the sun rises in the West." Other variants include "when the crayfish whistles" (Russian), "when the crow turns white" (Tagalog), "when the fish climbs the poplar" (Turkish), and "when it snows red snowflakes" (Hungarian).
VMvGD TIL the size and number of holes in Swiss cheese, also known as "eyes", can be controlled by adjusting the number of hay particles in milk used to make cheese.
rWw4 TIL that the co-founder of Paypal, Max Levchin, coded non-stop for 5 days without sleep and then finished the product 1 hour before he received $4.5 million in funding
bvp4 TIL the largest number of children born to one woman is recorded at 69. From 1725-1765, a Russian peasant woman gave birth to 16 sets of twins, 7 sets of triplets, and 4 sets of quadruplets.
K1W6 TIL Frank Zappa commisioned a quilt of panties that were thrown on stage from his 1980-1981 tour. He did not wash them first.