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TIL donations made by Jewish people often contain the number 18 (like $20.18), or are multiples of 18 (like $108.00). It's called “giving Chai”.

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via reddit.com

6E05X TIL During the Cold War, Soviet Union compiled a ultra meticulous map of Washington DC that are far more detailed than typical city maps we are all familiar with including details like precise width of roads, load-bearing capacity of bridges and location of water reservoir and pumping stations
J1jn4 TIL that Robert Cronin holds the World Records for longest time to complete an undergraduate program at 52 years and 111 days. He was a cardiologist who served as Dean of the Faculty of Medicine at McGill University from 1972 to 1977 and finished his undergraduate degree in 2000.
d8GDK TIL that giant squid brains are donut shaped and their esophagus runs right through it, making grinding its food into tiny pieces an evolutionary priority
EAP7 TIL that Target has 2 U.S. based forensic labs where they solve retail crimes, felonies, homicides, and special circumstances cases for law bureaus that need the extra manpower, facilities, resources and time – free of charge.
WkY9 TIL that our universe isn’t old enough for any of our red dwarf stars to have become blue dwarfs yet. So blue dwarfs are still theoretical.