Explains how the basic principles of elementary geometry were discovered over 2,000 years ago. Indicates the major roles played by the early civilizations of Mesopotamia, Egypt, and Greece.

From the early peoples who marvelled at the geometry of nature -- the beehive and bird's nest -- to ancient civilisations who questioned beautiful geometric forms and asked 'why?', the story of geometry spans thousands of years. Using only three simple tools -- the string, the straight-edge and the shadow -- human beings revealed the basic principles and constructions of elementary geometry. Weaving history and legend, this fascinating book reconstructs the discoveries of mathematics's most famous figures. Through illustrations and diagrams, readers are able to follow the reasoning that lead to an ingenious proof of the Pythagorean theorem, an appreciation of the significance of the Golden Mean in art and architecture, or the construction of the five regular solids.This insightful and engaging book makes geometry accessible to everyone. Readers will be fascinated with how the knowledge and wisdom of so many cultures helped shape our civilisation today.String, Straight-edge and Shadow is also a useful and inspiring book for those teaching geometry in Steiner-Waldorf classrooms.

Many of the things you know about science began with Archimedes. What was so unusual about a man who spent almost his whole life on one small island, more than two thousand years ago? Many things about Archimedes were unusual. His mind was never still, but was always searching for something that could be added to the sum of things that were known in the world. No fact was unimportant; no problem was dull. Archimedes worked not only in his mind, but he also performed scientific experiments to gain knowledge and prove his ideas.

A rapturous novel of star-crossed love in a time of war—from the international bestselling author of The Secret of Clouds. During the last moments of calm in prewar Prague, Lenka, a young art student, and Josef, who is studying medicine, fall in love. With the promise of a better future, they marry—only to have their dreams shattered by the imminent Nazi invasion. Like so many others, they are torn apart by the currents of war. Now a successful obstetrician in America, Josef has never forgotten the wife he believes died in the war. But in the Nazi ghetto of Terezín, Lenka survived, relying on her skills as an artist and the memories of a husband she would never see again. Then, decades later and thousands of miles away, an unexpected encounter in New York leads to an inescapable glance of recognition, and the realization that providence has given Lenka and Josef one more chance. From the glamorous ease of life in Prague before the occupation to the horrors of Nazi Europe, The Lost Wife explores the power of first love, the resilience of the human spirit, and our capacity to remember.