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TIL US prison workers produce $11bn worth of goods and services a year

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v16yB TIL that giraffes have valves that control blood flow up and down their necks. Without them they would pass out after lifting their head up from ground level.
nednr TIL Dodos were big, but not the fat birds we picture; the theory is that paintings and illustrations depicting them as such are based on overfed, captive specimens, or simply due to artistic license
9YEnM TIL the phrase "Until the bitter end" doesn't refer to feelings of bitterness, but instead is a Nautical term referring to the end of an Anchor, known as "The Bitter".
lok87 TIL about Christopher Roberts, a classical bassist, who in the 1980s hiked into Papua New Guinea's jungles with his bass and tape recorder. By doing so, he preserved a tribe's rich musical heritage & history, which were being lost because of mining & missionaries.
BrDed TIL one of the most important Allied aircraft of WWII, the De Havilland Mosquito, was built mainly from wood