Columbia's payload bay doors are ready to be closed for mission STS-107. Installed inside are the Hitchhiker Bridge, a carrier for the Fast Reaction Experiments Enabling Science, Technology, Applications and Research (FREESTAR) that incorporates eight high priority secondary attached shuttle experiments, plus the SHI Research Double Module (SHI/RDM), also known as SPACEHAB. STS-107 is scheduled for launch July 19, 2001