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Well, how do they know?
—Elizabeth Barell inquiring about the Eagle Nebula, 2001
Students across the country confront Design Challenge No. 1 posed by “Spaceday 2002 Adventure to Mars” (www.spaceday.com): “Invent a device that will make living or working on Mars easier.” This challenge results from the discovery that “unknown contaminants have polluted the water supply on the International Space Station.”