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(AP) - HYPED: Within days of billionaire entrepreneur Elon Musk's request for ideas to improve his proposed "Hyperloop" transportation system, a flood of submissions, from tinkerers to engineers, has arrived.
HIGHWAY WONDERFUL: The Hyperloop would shoot capsules full of people at the speed of sound through elevated tubes connecting Los Angeles and San Francisco.
BANDWAGON: A Utah firm hustled out a model using a 3-D printer. A Pennsylvania company is testing a virtual Hyperloop with sophisticated computer software. People for the Ethical Treatment of Animals wants ad space inside capsules, and in San Francisco, enthusiasts interested in "making Hyperloop a reality" will meet over beers.
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