In this March 26, 1979 file photo, Egyptian President Anwar Sadat, U.S. President Jimmy Carter and Israeli Prime Minister Menachem Begin clasp hands on the north lawn of the White House in Washington as they completed the signing of the peace treaty between Egypt and Israel. It seems as if violence is everywhere. Yet, historically, we've never had it this peaceful. That's the thesis of three new books, including one by Harvard psychologist Steven Pinker. Statistics reveal dramatic reductions in war deaths, family violence, racism, rape, murder and all sorts of mayhem. (AP Photo)