Word: upi
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...sized knapsack filled with some highly volatile non-inflammable gas which, strapped comfortably to our back, would be able to lift some 20, 30, or 40 pounds off our burden of flesh? ... If we should ever have knapsacks of unlimited power, our whole present day world will be turned upI side down. ... All the legislatures will be busily engaged in passing laws prohibiting people from leaving the earth too freely, or rules for the right of way up and down and sideways, or regulations against landing on the head of a fellow citizen or planting a foot on any part...