A future paleontologist would be puzzled by the huge differences between the bicycle and motor vehicle phyla, or between the boat and airplane phyla.
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There is a little mathematics game that people sometimes play. You start with x=0, do some long, complicated algebraic manipulations, and end up with x=1.
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Joseph LeConte, professor of geology at the University of California, provides an insight into the way most scientists think about evolution.
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Suppose an engineer attempts to design a structural analysis computer program, writing it in a machine language that is totally unknown to him.
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