Empathy is an emotional skill that most humans have some degree of mastery over. It allows us to feel emotions vicariously through others, and sometimes physical sensations as well. Most of us display a little empathy every day without ever being conscious of it because it is so integral to every aspect of our lives. Empathy is what compels us to yawn when we see someone else do it, to laugh at something funny, or to comfort someone in pain. Without...