With a simple hack, web cams can detect your heart-rate. Zeroing in on parts of the forehead, subtle changes in coloration due to blood flow can be measured.
Read more about it via BoingBoing:
boingboing.net/2013/04/16/detect-your-pulse-with-your-we.html
Actual code for download via GitHub:
github.com/thearn/webcam-pulse-detector
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