Stock Photo - Marshall Porterfield, director of the Space Life and Physical Sciences, NASA Headquarters, responds to a reporter's question during the May 21 International Space Station science forum, held at NASA's Johnson Space Center. Porterfield was joined by other panelists (all out of frame) -- NASA astronaut Steve Swanson, Expedition 40 commander aboard the International Space Station currently, who was connected via two-way audio and video communications; Duane Ratliff, Chief Operating Officer of the Center for the Advancement of Science in Space (CASIS); Julie Robinson of JSC, chief program scientist for the space station; Elizabeth R. Cantwell, co-chair of the National Research Council's decadal study; and Dan Huot, PAO moderator.

Stock Photo: Marshall Porterfield, director of the Space Life and Physical Sciences, NASA Headquarters, responds to a reporter's question during the May 21 International.

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