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The Forgotten Gadget That Powered The Industrial Revolution

Recently, a group of students at Purdue University used a simple device to make a ping-pong ball break the speed of sound. But that's not the coolest part. The device they used, called a de Laval nozzle, is actually centuries old. It's no exaggeration to call this the gadget that made the industrial revolution… » 2/18/13 11:44am 2/18/13 11:44am