“Most human traits are in a state of equilibrium, where the mean of the population also reflects the greatest biological fitness.”
Masculine and feminine faces
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7. University of Colorado at Boulder. (2011, January 12). Men with macho faces attractive to fertile women, researchers find. ScienceDaily. Retrieved September 2, 2017 from www.sciencedaily.com/releases/2011/01/110110154651.htm
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