This book rocks! I heard about Arthur Benjamin in a TED talk, and I was instantly amazed. His ability to calculate mentally was mind blowing! The second the video was over, I was dying to know his tricks. The next day, my dad told me he had written a book. I instantly bought it, reading every page with great interest.<br><br>For someone that doesn't like math on paper, or thinks it takes too long, this book is PERFECT. Although it may require some practice, the effort is totally worth it! The people that rated this book 1 star are mistaken. This book is NOT boring. You'll find yourself amazing your friends in no time! This book is a MUST! You'll love it!