This week in 1998, space shuttle Columbia, mission STS-90, landed at NASA’s Kennedy Space Center following a successful 15-day mission. Columbia’s primary payload was the Neurolab Spacelab module, the final Spacelab mission. Investigations during the Neurolab mission focused on the effects of microgravity on the nervous system, specifically the adaptation of the vestibular system, the central nervous system and the pathways that control the ability to sense location in the absence of gravity. Here, the Neurolab module sits in the orbiter’s cargo bay. The Spacelab missions were managed by NASA’s Marshall Space Flight Center. The NASA History Program is responsible for generating, disseminating and preserving NASA’s remarkable history and providing a comprehensive understanding of the institutional, cultural, social, political, economic, technological and scientific aspects of NASA’s activities in aeronautics and space. For more pictures like this one and to connect to NASA’s history, visit the Marshall History Program’s webpage. (NASA)