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Humans lose concrete recipe for 1300 years!
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Humans lose critical heat-shielding recipe for re-entry to Earth!
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NASA looks for heat shields in Smithsonian museum
"...according to the Orion program executive the Orion project originally intended to use the heat shield from the Apollo program
as a fallback technology for the Orion thermal protection system, but was unable to recreate the Apollo material."
(link) (pdf)
NASA has trouble with Newton's Law -- as contrasted with better analysis at
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Chernobyl nuclear experiment (no accident?)
