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TIL originally Chicago wasn’t built high enough above Lake Michigan to be able to dig sewers, so engineers lifted the entire city by 4-14 feet starting in 1855. The project took 20 years to finish.

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LQvgr TIL that serial killer Ted Bundy helped police catch Gary Ridgway, the "Green River Killer". In 1984, Bundy offered his opinions on the psychology, motivations, and behavior of the killer, and that he was revisiting body dump sites, which turned out to be true. Ridgway was arrested in 2001.
e04d5 TIL about Euler's disk, which can spin for an absurdly long time, and seemingly defy gravity by increasing its axial precession as it decreases it's azimuthal rotation.
KOAQ4 TIL - Personality has a larger effect on success than IQ.
AoJn TIL that over 11,000 untested rape kits dating back to the ‘80s were found in an abandoned Detroit PD storage room. Detroit isn’t the only major city with an egregious backlog–Memphis has over 12,000 untested kits.
110d TIL Jimmy the Greek Snyder bet $10,000 at 17–1 odds on Harry Truman to defeat Thomas Dewey in the 1948 election, because Dewey had a mustache and “American women didn’t trust men with a mustache”. In today’s dollars, that bet netted him over $1.7 Million.