NASA is scheduled to launch the orbiter Discovery on Wednesday, March 11 at 9:20 p.m. EST. Two of the astronauts have teaching backgrounds. The following comes from the NASA site. Joseph Acaba was raised in Anaheim, Calif. He earned a bachelor's and a master's in geology from the University of California, Santa Barbara, and the University of Arizona, Tucson, respectively. He has middle school and high school math and science teaching experience. One year of high school experience at Melbourne High School, Florida and four years of middle school experience as a math and science teacher at Dunnellon Middle School, Florida. . He was selected as an astronaut in 2004. Richard Arnold, raised in Bowie, Md., earned a bachelor's degree in science and completed the teacher certification program at Frostburg State University, Md. He earned a master's in marine, estuarine and environmental science from the University of Maryland, College Park. He has teaching experience at middle schools and high schools around the world. In 1996, he and his family moved to Riyadh, Saudi Arabia, where he was employed as a middle and high school science teacher and Science Department Chair at the American International School. In 2001, Arnold was hired by International School Services to teach middle school mathematics and science at the International School of Kuala Kencana in West Papua, Indonesia. In 2003, he accepted a similar teaching position at the American International School of Bucharest in Bucharest, Romania. He was selected as an astronaut in 2004.