Workers stand by as an overhead crane moves the Japanese Experiment Module called Kibo for weighing.

In the Space Station Processing Facility at NASA's Kennedy Space Center, workers stand by as an overhead crane moves the Japanese Experiment Module, called Kibo, onto the scale for weighing. Also known as the JEM-PM, the module is the primary payload for space shuttle Discovery's STS-124 mission, which is targeted for launch to the International Space Station on April 24. Photo credit: NASA/Jim Cain