CAPE CANAVERAL, Fla. - In the Space Station Processing Facility at NASA's Kennedy Space Center in Florida, the Biotube experiment is being prepared for launch to the International Space Station aboard a SpaceX Dragon spacecraft. Biotube-MICRO will investigate the potential for magnetic fields to orient plant roots as they grow in microgravity. Scheduled for launch on March 16 atop a Falcon 9 rocket, Dragon will be marking its fourth trip to the space station. The SpaceX-3 mission is the third of 12 flights contracted by NASA to resupply the orbiting laboratory. For more information, visit http://www.nasa.gov/mission_pages/station/structure/launch/index.html Photo credit: NASA/Kim Shiflett