Did you know that the incidence of cancer in the United States has been declining for nearly 20 years? That the spread of pornography correlates with a decline in rape? That average IQs are going up substantially all around the world? These are just some of the truths that are well-known to the scholars who study those subjects but generally come as a surprise to even the best-educated among us. As Reason reflects on how the world has changed since the magazine's founding in May 1968, Science Correspondent Ronald Bailey presents seven surprising pieces of unalloyed good news.