books.google.com - The 'Flynn effect' refers to the massive increase in IQ test scores over the course of the twentieth century. Does it mean that each generation is more intelligent than the last? Does it suggest how each of us can enhance our own intelligence? Professor Flynn is finally ready to give his own views. He...https://books.google.com/books/about/What_Is_Intelligence.html?id=qvBipuypYUkC&q=Arithmetic&utm_source=gb-gplus-shareWhat Is Intelligence?