"Normally, when you hit a baseball with a bat, theproperties of the bat don't change -- it won't turn to Silly Putty. In theearth, the properties do change, which creates an exciting computationalproblem," says Gurnis. "If the system is too nonlinear, the earthbecomes too mushy; if it's not nonlinear enough, plates won't move. We need tohit the 'sweet spot.'"
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