Matt Reynolds, an assistant professor in the electrical and computer engineering department at Duke University, wears other hats, too--including that of co-founder of two companies, reports the New York Times. These days, his interest is in a real hat now in prototype: a hard hat with a tiny microprocessor and beeper that sound a warning when dangerous equipment is nearby on a construction site. What’s unusual, however, is that the hat’s beeper and microprocessor work without batteries. They use so little power that they can harvest all they need from radio waves in the air. The waves come from wireless...
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