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The Week In Numbers: A Real Jetpack, The Dangers Of Laughing, And More

The Week In Numbers: A Real Jetpack, The Dangers Of Laughing, And More

Popular Science - By Rose Pastore

63 miles per hour: the speed of the P12 Jetpack, a personal flight device that can reach 8,000 feet 50 hours: the time it took electrical engineer Chris Fenton to build this 3-D printed, hand-cranked calculator that uses punch cards, string, and rubber bands to execute functions (video) 2018: the …

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