STS089-301-037 (22-31 Jan. 1998) --- Astronaut David A. Wolf, recently transferred to the STS-89 crew as mission specialist, works with samples in the Commercial Generic Bioprocessing Assembly (CGBA) onboard the Earth-orbiting space shuttle Endeavour. Wolf had earlier completed a four-month tour of duty on the Russian Space Agency's (RSA) Mir Space Station, as a cosmonaut guest researcher. Photo credit: NASA