NEW YORK, United States (Reuters) — Gitanjali Rao, an 11-year-old from Lone Tree, Colorado, won the 2017 Discovery Education 3M Young Scientist Challenge for inventing Tethys, a device that detects lead in water. “Tethys, the Greek goddess of fresh water, is a lead detection tool,” Rao said. “What you do is first dip a disposable cartridge, which can easily be removed and attached to the core device in the water you wish to test. Once […]