Turn Your Head Into Speakers?

This story really appealed to two of my passions, gadgets and high-quality audio. Etrema is an Iowa-based company that is a spinoff from the U.S. Department of Energy lab of Iowa State University. The company has developed products made with a "smart" metal that can turn your walls or your head into speakers. The smart metal in all of Etrema's offerings is something called Terfenol-D, a metal that changes its shape--as quickly as 20,000 times a second--when exposed to a magnetic field. A...

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