A baby born five to 10 years from now in a developed country may get a tattoo not long after her first feeding. It would be an integrated circuit, a discreet and flexible affair, smaller than a postage stamp and probably placed on the chest. It would monitor such biometric parameters as electrocardiogram (EKG), physical activity, nutritional status, sleep duration, breathing rate, body temperature, and hydration. By the time the child is two years old, she will have generated and stored in the cloud more biometric data than has anyone alive today, says Leslie Saxon, chief of the division of cardiovascular medicine at the University of Southern California's Keck School of Medicine.
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