"The Better Angels of Our Nature: Why Violence Has Declined" by Steven Pinker Penguin Group, Rebecca Goldstein Jeff Glor talks to Steven Pinker about, "The Better Angels of our Nature," a book that shows, if you think the world is violent today, it's nothing compared to what it used to be like. Jeff Glor: What inspired you to write the book? Steven Pinker: I believe there is such a thing as human