Tracy Caldwell Dyson, Astronaut, her connection to American Sign Language and why she decided to be the first person to sign on the International Space Station.

Tracy Caldwell Dyson, Astronaut, describes preparing for and experiencing her first space walk.

Tracy Caldwell Dyson, Astronaut, describes how she discovered that she wanted to be an astronaut. She compares the excitement of "launch" versus "landing" and describes the thrill of being your own “satellite” during her three space walks.