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TIL That leading scientists speculate that alien life might be present nearby, and we might not even notice each other due to the profound difference in technology and evolution.

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JYa61 TIL that the Colt 1911 pistol was purposely designed to be fully disassembled with its own internal parts and no other tools are necessary.
vPwxD TIL that Rudolf Schenker, guitarist and found of Scorpions, is such a massive fan of the show Gilmore Girls that he wrote the song "Lorelei" as a love letter to it's leading character.
Rpvw TIL in 1979 flying LAX-JFK and upgrading to first class was only 20% of the ticket price. Today it’s 225%.
8aABL TIL that Ligers [Lion+Tiger hybrids] aren't sterile. In fact, there's a 2nd gen hybrid species called Liligers, which are bred from a female Liger and a male Lion. While ligers often inherit the sandy coloring and stripes of its parentage, liligers often develop rosettes similar to a leopard.
Yk0x TIL There is a piece of music currently being played that will take 639 years to complete, ending in 2640.