Scientists, __________ one of Indian origin, have __________ an ultra-thin device that can power your smartphone, fitness tracker and other gadgets using human movements such as walking and waving. Based on battery_______ , and made from layers of black phosphorus that are only a few atoms thick, the energy harvesting system _______ small amounts of electricity when it is bent or pressed even at the __________ low frequencies characteristic of human motion. Scientists, __________ one of Indian origin