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TIL the 1.5-mile-long, 22-foot-high, 4.5-foot-wide granite wall, that currently surrounds the Minnesota State Correctional Facility in St.Cloud, Minnesota, USA is the second largest wall built using inmate labor in the world. The Great Wall of China is the first.

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via reddit.com

d8m6d TIL of a top secret US Cold War project "Iceworm" to build nuclear missile sites under the Greenland ice sheet. Abandoned due to ice instability it was assumed the chemical and radioactive waste would remain under the ice forever. It's now predicted this waste will re-enter the environment in 2100.
9lG6 TIL that a recently published study out of Spain found that THC seems to target and kill some forms of human brain cancer.
M7oZa TIL "Save Me" by Aimee Mann is about Dave Foley (Kids In The Hall, NewsRadio)
e0Xek TIL Conchobar mac Nessa, the legendary Irish king, was conceived because his mother asked a druid, Cathbad, what that moment was right for, and Cathbad said, "conceiving a king." Cathbad was the only available man for the conception.
9YvwM TIL the combined wealth of the top 8 billionaire is equal to the combined wealth of the world's poorest half(3.6bn people)