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Elon Musk's Ingenious, Implausible Hyperloop
Hyperloop:  The technology world responded with exuberant enthusiasm, the transportation world by noting the plan's serial implausibilities.
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If you're a nerd like me, it certainly sounds appealing.
Elon Musk, the restless innovator behind SpaceX and Tesla Motors, yesterday unveiled the engineering details behind the Hyperloop, an elevated system of steel tubes that he says could move passengers enclosed in aluminum pods from Los Angeles to San Francisco in 35 minutes, at a total construction cost of $6 billion over 20 years.