KSC-98pc578

STS-90 Mission Specialists Dafydd (Dave) Williams, M.D., with the Canadian Space Agency (left) and Richard Linnehan, D.V.M., inspect the orbiter Columbia's tires in the evening after their midday arrival on May 3, ending their nearly 16-day Neurolab mission. The 90th Shuttle mission was Columbia's 13th landing at the space center and the 43rd KSC landing in the history of the Space Shuttle program. During the mission, the crew conducted research to contribute to a better understanding of the human nervous system