One of the reasons I hang out with people different than I am and read rather widely is to expose myself to ideas I would not otherwise get. It enriches my life and gives me opportunities I could never create on my own. I frequently tell students my association with others has provided me better things in life than I ever could have come up with on my own. If I had only followed my own dreams, my life would have been much poorer. A recent article I discovered on Twitter, which is actually an extended interview, provoked me to think about the theme of optimism. I have thought about it in the context of hope. But I had never really explored the theme. The article is by Steven Pinker, who is a cognitive psychologist and linguist at Harvard. He is a popular figure, but one who is doing serious work. He is one I trust. One question Pinker was asked was why so many folks are such negative nellies. His response comes from his scientific res...