8-year-old's fossil discovery reveals how turtles got their shells
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If you ask most people to guess why turtles first developed shells, you'll usually get one answer: the hard shells protect them from predators. If you've always believed this, you're in good company. This is exactly the theory scientists have been working with for decades. However, a new study has found that everything we thought we knew about the evolution of the turtle is probably wrong -- and we have one 8-year-old boy from South Africa to thank. The study examines...