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By BILL DANIELSON

For most people, Memorial Day marks the first day of summer. The official first day may not actually be observed until three weeks later, but the three-day weekend gives people a chance to get outside and fire up the grill, or perhaps even go camping....

By BILL DANIELSON

During a recent lecture on evolutioin I had to explain the differences between three different processes known as geographic, temporal and behavioral isolation. Geographic isolation is the easiest of these concepts to understand because it involves...