Download PDF eBooks ... The noted expert and longtime author of Scientific American 's Mathematical Games column selects 70 of his favorite 'short' puzzles. Enthusiasts can challenge their skills with such mind-bogglers as The Returning Ex…

Download PDF eBooks ... The Uffizi Gallery in Florence, Italy is one of the world's oldest and most visited museums. Originally the museum housed the art collections of the Medici family. The museum has one of the best collections of Itali…