Photograph by Brent Humphreys
Master woodcarver Larry Parks has meticulously recreated the Wright brothers' propellers, down to the tool marks they left on the wood.
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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