Word: subteen
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Dates: during 1958-1958
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...rocket fuel is really safe, even the scraped-off match-head material that is popular with subteen-agers. When the fuel burns, it generates gas inside the rocket. If the gas is allowed to escape too easily, its pressure remains low and it generates too little thrust to get the rocket off the ground. If it is confined too much, its pressure rises too high and makes the rocket explode...