We modern humans are smug about our progress through time. No longer do we hunt, kill, and build a fire to enjoy our dinner. We don't make love in desperation and hope we live to see the sunrise; however, we have retained certain behavioral patterns and personality traits from those early days, and they remain ingrained in our personalities and cultures. Yes, we advanced and changed everything around us, making it possible for the weak and silliest among us to thrive. Yet, despite our advances and pretenses of modernity, we are the same basic creatures who sought shelter in caves and worried...