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The Failure of Nerve
The Failure of Imagination
The Future of Transport
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able achieved already animals asteroid astronautics astronomers atmosphere atoms body brain century Chapter completely course creatures developed device direction discovered Earth electric electronic energy engineering exist exploration exploration of Jupiter extraterrestrial fact fantasy Flatland fourth dimension future Galaxy global TV gravitational field Ground Effect Heinlein horsepower human hundred idea imagine impossible intelligence invention invisibility Jupiter Leonardo da Vinci less light light-years limited living look machines magnetic matter means mechanical mental merely miles an hour million miles million million million Moon moving Murray Leinster never nuclear object operate orbit past perhaps physical planet possible problem produce radio reach rocket satellite science fiction science-fiction scientific scientists seems sense ship solar system space speed speed bands stars surface techniques temperatures thousand tion today's tons transportation universe vehicles velocity VTOL waves weight weightless