Mr. B and a article http://www.popsci.com/diy/article/2011-05/2011-invention-awards-picture-health
This mirror is super cool! It has a web cam that captures variations in reflected light on your face, and an algorithm translates that into heartbeats. It can tell you your heartbeat just by looking at you. It is reliable to the extent that you will trust it. For people with heart conditions, this mirror could come in handy.
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