The user applies pressure with a fingertip while following instructions from the unique smartphone app to measure blood pressure using the clip. The clip, a plastic attachment that was 3D-printed ...

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Grandfather Who Saved 2.4 Million Babies by Donating Blood More Than 1,100 Times Over 60 Years Dies at 88 Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on ...