Enlarge ImageCancer fighter. The naked mole rat isn't much to look at, but it has an effective way of combating cancer. Credit: Trisha M. Shears With its wrinkled skin and bucked teeth, the naked mole rat isn't going to win any beauty contests. But the burrowing, desert rodent is exceptional in another way: It doesn't get cancer. The naked mole rat's cells hate to be crowded, it turns out, so they stop growing before they can form tumors. The details could someday lead to a new strategy for treating cancer in people. In search of clues to aging, cell...