Presented by collectSPACE.com — The Source for Space History and Artifacts. When Dr. Don Pettit lived aboard the International Space Station in 2002, he became known for his “Saturday Morning Science” sessions, during which he would demonstrate really cool, simple microgravity experiments. Earlier this month, Pettit returned to space, this time as member of space shuttle Endeavour’s crew on a mission to upgrade the outpost. After 10 days of hard work, the STS-126 crew got some time off …