Imagine being able to travel from San Francisco to Los Angeles in about 30 minutes -- in half the time that it now takes to fly the nearly 650-kilometer distance. That is the idea announced Monday by entrepreneur Elon Musk. The "Hyperloop" would use a large tube. Inside, capsules would float on air, traveling at more than 1,100 kilometers per hour. The air would be sucked by a powerful fan at the front and expelled at the rear. The system is not unlike the pneumatic tubes that ...
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