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It's sweltering in Boston, and a dozen Tufts University coeds are out in shorts and tanks, attracting the usual stares. Only today the stares are for a different reason: the girls are huddled around a 750-pound machine that looks like a spaceship, long and wide with a bubble-shaped cockpit open to reveal a mass of pipes and wires. It's actually a solar car—one they've built from the ground up and hope to race next year.