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acceleration aeroplane Air Force aircraft alpha rays already apparatus artificial atmosphere atomic automatic automatons automobile aviation become blood body brain braking breathing carbon dioxide centrifuge century Charles Yeager clock cockpit consequences course danger deceleration decibels degrees distance earth effects electronic computers elements energy engineer example experiment explosion eyes faster feel feet fission flight flyers flying free neutrons head heat high altitudes high speeds human hundred hydrogen bomb instruments isotopes jet planes John Paul Stapp laboratory later living machines matter miles per hour millimetres million minutes motor moving neptunium neutrons noise normal nuclear nuclei oxygen parachute particles passengers physicist pilot plants pounds pressure problem Professor Strughold protons radiation radioactive radium rays reached reaction record result robots rocket roentgens scientists sealed cabin seat space speed of sound Stapp stratosphere supersonic temperature traffic tremendous uranium velocity weight weightlessness X-ray