3M and Discovery Education Oct. 18 announced that an 11-year-old Indian American girl, Gitanjali Rao, has been named the 2017 Discovery Education 3M Young Scientist Challenge winner. Rao, of Lone Tree, Colo., was chosen from a group of 10 finalists, which included five Indian American kids in capturing the $25,000 top prize and title of America`s Top Young Scientist at the 10th annual event. The tween is working to develop Tethys, a sensor-based device that can detect lead in water faster than other current techniques. Rao`s cost-effective approach to water safety uses a mobile app that populates the water`s status almost immediately. Tethys is designed to be portable and easy to use, allowing individuals to test water safety whenever needed. She hopes to solve the water contamination crisis and decrease long-term health effects from lead exposure. Rao, a seventh-grader at STEM School and Academy, competed alongside the nine other finalists during a live competition at the 3M Innovation Center in St. Paul, Minn.