A group of lab students hover over a badly crushed fossil of a human skull. A young woman kneels with her hands folded in front of her while at the alter. Many excited children marvel over a cute little creature named ET pointing to the sky and saying, "ET phone home." What does each of these scenarios have in common? What each person believes is the origin of human existence has been a controversial issue for nearly as many years as scientists, theologians, and alien enthusiasts have been established. The idea of human evolvement can be class ....