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Workers inside the Multi-Purpose Logistics Module Leonardo check connections while installing a laboratory rack. Leonardo is the first of three such pressurized modules that will serve as the International Space Station's “moving vans,” carrying laboratory racks filled with equipment, experiments and supplies to and from the Space Station aboard the Space Shuttle. Approximately 21 feet long and 15 feet in diameter, Leonardo will be launched on Shuttle mission STS-102 March 1, 2001. On that flight, Leonardo will be filled with equipment and supplies to outfit the U.S. laboratory module, being carried to the ISS on the Jan. 19, 2001, launch of STS-98.