Paul Erdos was an amazing and prolific mathematician whose life as a world-wandering numerical nomad was legendary. He published almost 1500 scholarly papers before his death in 1996, and he probably thought more about math problems than anyone in history. Like a traveling salesman offering his thoughts as wares, Erdos would show up on the doorstep of one mathematician or another and announce, "My brain is open." After working through a problem, he'd move on to the next place, the next solution.

Hoffman's book, like Sylvia Nasar's biography of John Nash, A Beautiful Mind,...

On the eve of the centennial of the Wright brothers' historic flights at Kitty Hawk, a new generation will learn about the other man who was once hailed worldwide as the conqueror of the air--Alberto Santos-Dumont. Because the Wright brothers worked in secrecy, word of their first flights had not reached Europe when Santos-Dumont took to the skies in 1906. The dashing, impeccably dressed inventor entertained Paris with his airborne antics--barhopping in a little dirigible that he tied to lampposts, circling above crowds around the Eiffel Tower, and crashing into rooftops. A man celebrated,...

Based on a National Magazine Award-winning article, this masterful biography of Hungarian-born Paul Erdos is both a vivid portrait of an eccentric genius and a layman's guide to some of this century's most startling mathematical discoveries. photos.