One Day in 2006, stuck in bumper-to-bumper Bay Area traffic, Amir Abolfathi had a eureka moment. Formerly vice president of R&D for Invisalign, a company known for transparent dental braces, he had recently been chatting with a friend who was working on hearing aids. Abolfathi knew that bone was a good sound conductor. What if he could somehow make a removable oral hearing aid-one that could channel sound from wearers' teeth to their ear through the bones in their head?
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