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"Groundbreaking" Ultrasound Device Invented By PhD Student
Ultrasound machines can cost $20,000 or more and weigh 30 pounds, but
not George K. Lewis's ultrasound device. Lewis's portable therapeutic
ultrasound machine cost him about $150 to make -- 80 percent of which
was spent on the battery -- it fits in the palm of his hand, and it can
help treat cancer and relieve arthritis... among other things.
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