The conditions inside the Fulton County Jail system are dire. Inmates at one of the jails in Atlanta, Georgia, are sleeping on the floor in plastic trays. Cell doors hang off hinges, footage from one ...
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How Your Smartphone Camera Could Track Your Heart Rate
Back in the 1940s, a Dutch physician called John Poel invented a device that changed the nature of heart monitoring. His device is based on the idea that the color of skin changes according to the ...
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