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 ...

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 ...

Heart rate is one of the most basic and important indicators of health, providing a snapshot into a person's physical activity, stress and anxiety, hydration level, and more. Traditionally, measuring ...