Experimentation leading to an understanding of life processes under reduced and extremely low gravitational forces will profoundly contribute to the success of future space missions involving humans. In addition to research on gravitational biology, research on the effects of cosmic radiation and the interruption and change of circadian rhythms on life systems is also of prime importance. Research in space, however, is currently viewed by biological scientists as an arena that is essential, yet largely inaccessible to them for their experimentation. To fulfill this need, a project and spacecraft system described as the Reusuable Reentry Satellite or Lifesat has been proposed by NASA. Swenson, Byron L. and Mascy, Alfred C. and Carter, Bruce and Cartledge, Alan and Corridan, Robert E. and Edsinger, Larry E. and Jackson, Robert W. and Keller, Robert and Murbach, Marcus S. and Wercinski, Paul F. Ames Research Center...