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TIL out of the 270 Space Shuttle Solid Rocket Boosters launched, all but four were recovered. Over 5,000 parts were refurbished for reuse after each flight, and the final set of SRBs that launched STS-135 (2011) included parts that flew on 59 previous missions, including STS-1 (1981).

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yVy5a TIL that birds are now using anti-bird spikes to build their nests.
m1VKR TIL William Thornton, a doctor and the architect who designed the US Capitol Building, was summoned to George Washington's home to treat his illness, arriving after his death. Thornton devised a plan to resurrect his corpse by inflating air into his lungs and transfusing lamb's blood into his body.
7rjgX TIL the Guinness Book of World Records lists Deinococcus radiodurans bacterium as the world's toughest organism because of its ability to survive extreme radiation, cold, dehydration, vacuum and acid. These bacteria were found to survive 3 years in outer space based on studies conducted on the ISS.
wLY TIL that prior to WWII, the U.S. authorized millions of dollars for “War Plan Red,” a military strategy to invade Canada and destroy Britain. However, the start of WWII prevented the plan from ever seeing the light of day.
D1vNr TIL, mongooses found in Hawai’i are native to India and were originally introduced to Hawai’i Island in 1883 by the sugar industry to control rats in sugarcane fields and have since caused the extinction of 8 federally listed endangered Hawaiian birds.