A volunteer (far right) from the local community explains how to use smart garbage sorting cans to residents of a community in the high-tech zone of Hai'an, Nantong, a city in East China's Jiangsu province, on June 4. Several smart garbage cans have been placed throughout the residential area. These machines are capable of determining the type and weight of trash and calculating its value. Residents can scan a QR code to receive points from disposing of garbage, which they can redeem for gifts. [Photo/IC]