How Apple Watch uses green light to take your pulse

Cult of Mac
By Buster HeinApr 22, 2015, 2:34 pm393 pts
Apple Watch promises to be the most personal device you’ve ever strapped yourself by keeping track of everything from your movement to your heart rate, 24 hours a day. Mixing high-tech with high-fashion can be tricky, but in a new… Read more ›

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