Professor Michael Hoffman of California Institute of Technology (CIT) explains his research and development team's winning entry at the "Reinvent the Toilet Fair" competition at the Bill and Melinda Gates Foundation campus in Seattle, Washington on August 14, 2012. CIT's winning design named "self sustaining photo electrochemical wastewater treatment toilet" won first place amongst 28 competitors. The fair showcases innovations in health and sanitation from around the world and is focused on promoting efforts to reinvent the toilet. REUTERS/Anthony Bolante (UNITED STATES - Tags: SCIENCE TECHNOLOGY HEALTH ENVIRONMENT)