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microgravity and re-adapt to Earth's gravity on return. Other experiments were designed to investigate materials science, plant biology and cosmic radiation, and tests of hardware proposed for the Space Station Freedom Health Maintenance Facility. The mission completed 146 orbits of the Earth, and Seddon logged an additional 218 hours in space.[1][50] From September 1991 to July 1992, Seddon was a Capsule Communicator (CAPCOM) in the Mission Control Center, handling the STS-42 and STS-45 missions.[51][52] She expressed a desire to Chief Astronaut Dan Brandenstein to participate in SLS-2, the follow-up mission to SLS-1. This was readily accommodated, as life sciences missions were not popular assignments among astronauts.[53][54] In October 1991 she was designated the payload commander for the STS-58 / SLS-2 mission.[55][56] This was a new position created to provide a single point of contact for the science crew.[57] During training for the mission, she broke four bones in her foot while sliding down a Space Shuttle escape slide during a practice for an emergency evacuation. This was diagnosed as a Lisfranc fracture. Surgery was required to insert screws to realign the bones, and she had to spend six weeks in a cast and another six in a walking boot. This did not leave much time before the launch date, but there was no move to replace her, and the flight was delayed a few months for other reasons.[58][59] Seddon spins the Spacelab Life Sciences rotating chair as Martin Fettman serves as a test subject on the STS-58 mission SLS-2 involved animal testing, with mice being dissected in space. At this time NASA management began to feel pressure from animal rights groups, and NASA Administrator Dan Goldin asked for a report on the animal experiments. Seddon and payload specialist Martin J. Fettman prepared a report on how the research could be conducted without killing animals, which amounted to removing body parts without killing them. Seddon and Fettman felt that this was unethical. NASA management ordered the Director of Flight Crew Operations, David Leestma, to modify the experiments to harvest organs with