Mathemania Author:Raymond Blum Abracadabra and 1-2-3! Amaze your friends and stump your parents with mathematical magic tricks. You don't need magician's equipment to perfect each feat; just practice it a few times. Some will turn you into a mind reader: for example, just ask an audience member to roll some dice and stack them. Then, voila! You'll conjure up the total numbers... more » on the hidden dots and tell everyone. Or, guess a word someone has picked from a dictionary. Want to make a little "Pumpkin Pi?" ("Pi," in algebra, is what you get when you divide the circumference of a circular object by its diameter.) Here, no matter what number someone enters into a calculator, the result is always a "piece of pi." Plus: a little card sorcery, mind-boggling magical things you can do with paper, and many more.« less