Kenneth Silberman, an engineer at NASA's Goddard Space Flight Center, speaks to students from the Maryland School for the Blind during a visit to NASA Headquarters in Washington, Thursday, Oct. 29, 2009. Seven students from the Maryland School for the Blind visited NASA and participated in activities to learn about NASA'smission, functions, and careers. Photo Credit: (NASA/Paul E. Alers)

Maryland School for the Blind student Andrea Washington, left, and Kenneth Silberman, an engineer at NASA's Goddard Space Flight Center, use their sense of touch on a model of the Ares I-X rocket during a visit to NASA Headquarters in Washington, Thursday, Oct. 29, 2009. Seven students from the Maryland School for the Blind visited NASA and participated in activities to learn about NASA'smission, functions, and careers. Photo Credit: (NASA/Paul E. Alers)