books.google.com - Why is math so hard? And why, despite this difficulty, are some people so good at it? If there’s some inborn capacity for mathematical thinking—which there must be, otherwise no one could do it —why can’t we all do it well? Keith Devlin has answers to all these difficult questions, and in giving...http://books.google.com/books/about/The_Math_Gene.html?id=R7xvHHhU0ZYC&q=whole+numbers&utm_source=gb-gplus-shareThe Math Gene