according to new research from the University of Utah. Males' upper bodies are built for more powerful punches than females', says the study, published in the Journal of Experimental Biology... For years, Carrier has been exploring the hypothesis that generations of interpersonal male-male aggression long in the past have shaped structures [as if there was no Designer] in human bodies to specialize for success in fighting... It's already known that males' upper bodies, on average, have 75% more muscle mass and 90% more strength than females'. But it's not known why. "The general approach to understanding why sexual dimorphism evolves,"...