If you delicately unwound the whip-like flagellum of a sperm from the fruit fly Drosophila bifurca, it would stretch out 6 centimeters -- 20 times as long as the fly-guy that made it. "To put that into perspective," says Adam Bjork, a graduate fellow at Syracuse, "if humans made sperm that long and you took a six-foot man and stood him on the goal line of a football field, his sperm would stretch out to the 40-yard line."Can't imagine it!
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