If being sensitive to others were truly limited to our species, this would make it a young trait, something we evolved only recently. The problem with young traits, however, is that they tend to be experimental. Consider the human back. When our ancestors started walking on two legs, their backs straightened and assumed a vertical position. In doing so, backs became the bearers of extra weight. Since this is not what the vertebral column was originally designed for, chronic back pain became our species’ universal curse. If empathy were truly like a toupee put on our head yesterday, my greatest
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