Elon Musk unveils "Hyperloop"

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With his Hyperloop proposal, Elon Musk isn't the only entrepreneur proposing ways to rev up American transportation. The man who brought us sleek, clean electric Tesla cars and SpaceX — a private space program that successfully sent a payload to the orbiting space station — is setting his sights on a radically different mass transit proposal called Hyperloop. Giant vacuum tubes would suck travelers across thousands of miles in a matter of minutes. Technology in the Digital Age is spurring countless ideas aimed at improving — and even reinventing — the way humans travel. The issue is becoming a pressing one with increasing traffic and vehicle emissions.