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TIL that 30% of people are iron-deficient. Successful treatment could raise national productivity 20%

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via reddit.com

XEWV8 TIL that Steve Irwin and his father discovered a species of turtles that can breathe through their cloaca in 1990. It's named after them: Irwin's turtle.
9w5EQ TIL that a man killed his mother for not allowing him to buy Avril Lavigne concert tickets in 2008
kJd5m TIL the guy who held the John 3:16 sign at sporting events was arrested for multiple kidnappings and is serving a life sentence.
8Gk4 TIL Silversun Pickups are named after a liquor store called Silversun in LA where band members often made late night booze runs
MeGa0 TIL 'Golden Age' 3-D movies had a built-in intermission point around the 50 minute mark. Carbon arc rods on the projectors used for the light source could not burn for more than an hour. The intermission would last 10 minutes, enough time to re-thread both projectors and install new carbon rods.