Escalators run at one speed: slow. But they could become high-speed transports if research at Mitsubishi pans out. Engineers there have invented a way to increase an escalator's speed by 50 percent on straightaways while maintaining a safe, slow pace at entry and exit points. The trick: Large-diameter pulleys at the escalator's edges force the rollers supporting the steps to take wide turns, slowing them down. Mitsubishi hopes to commercialize the variable-speed escalator within two to three years.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.


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