English: Three levitating/freely floating calculators HP-41C in the cockpit of Space Shuttle Challenger during mission STS-7, end of June 1983. The image is a section of, respectively a crop of, a much larger image (see below) with astronaut Dr. Sally K. Ride on it. (Original NASA image description:) Astronaut Sally K. Ride, STS-7 mission specialist, performs a number of functions simultaneously, proving the necessity for versatility and dexterity in space travel. Floating freely on the flight deck, Dr. Ride communicates with ground controllers in Houston, moves within feet of important reference data, hand calculators and other aids all at the same time. She is one of the five astronaut crewmembers for the Challenger's second orbital mission. Her head is in the station normally occupied by the pilot (in this case, Federick H. (Rick) Hauck) and her feet are anchored at the station for the crew commander (in this case, Robert L. Crippen).