Aboard the International Space Station, Expedition 47 Flight Engineer Jeff Williams of NASA fielded questions from attendees at the USA Science and Engineering Festival in Washington, D.C. on April 16. Sponsored by the Center for the Advancement of Science in Space (CASIS), the festival is designed to bring educators, industry and government leaders together to focus attention on the needs of our country to inspire youth to become involved in the fields of science, engineering and math. Williams will remain at the station until September; this is his third long-duration mission on the complex.