A $13.5 million award from the Bill & Melinda Gates Foundation will improve sanitation to 2.5 billion people worldwide by reinventing the toilet, technology that hasn’t changed much in more than a century. Shown are Mechanical Engineering Associate Professor Shannon Yee and GTRI Research Scientists Kevin Caravati, and Ilan Stern, who are leading the Georgia Tech portion of the initiative. (Photo: Allison Carter, Georgia Tech)