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Smart watches use a flashing green light to measure your heart rate and an rad and inferred light to measure your oxygen saturation. The way it works is really clever.
Check out Andrew Steele's video here: https://www.youtube.com/watch?v=fDj2kYIF-sE
Check out my Motion Amplification video here: https://www.youtube.com/watch?v=rEoc0YoALt0
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