To see that formula in action, I ride up the road to the town of Hanover, where Hypertherm Inc makes equipment used around the world to cut steel and aluminium.

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Mechanics spot strange things stuck under cars all the time, but when 20-year-old Yasir Afifi's ride was put up on lifts his shop found something that hadn't been kicked up from the road: a cylindrical tube connected to a device with an antenna.

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