She has been a legend ever since. In this engrossing book, Maria Dzielska searches behind the legend to bring us the real story of Hypatia's life and death, and new insight into her colorful world.Historians and poets, Victorian novelists and contemporary feminists have seen Hypatia as a symbol--of the waning of classical culture and freedom of inquiry, of the rise of fanatical Christianity, or of sexual freedom. Dzielska shows us why versions of Hypatia's legend have served her champions' purposes, and how they have distorted the true story. She takes us back to the Alexandria of Hypatia's day, with its Library and Museion, pagan cults and the pontificate of Saint Cyril, thriving Jewish community and vibrant Greek culture, and circles of philosophers, mathematicians, astronomers, and militant Christians. Drawing on the letters of Hypatia's most prominent pupil, Synesius of Cyrene, Dzielska constructs a compelling picture of the young philosopher's disciples and her teaching. Finally she plumbs her sources for the facts surrounding Hypatia's cruel death, clarifying what the murder tells us about the tensions of this tumultuous era.

    He studied the flight patterns of birds to create some of the first human flying machines; designed military weapons and defenses; studied optics, hydraulics, and the workings of the human circulatory system; and created designs for rebuilding Milan, employing principles still used by city planners today. Perhaps most importantly, Leonardo pioneered an empirical, systematic approach to the observation of nature-what is known today as the scientific method.Drawing on over 6,000 pages of Leonardo's surviving notebooks, acclaimed scientist and bestselling author Fritjof Capra reveals Leonardo's artistic approach to scientific knowledge and his organic and ecological worldview. In this fascinating portrait of a thinker centuries ahead of his time, Leonardo singularly emerges as the unacknowledged “father of modern science.”From the Trade Paperback edition.

    A simple web search picks out a handful of relevant needles from the world's biggest haystack: the billions of pages on the World Wide Web. Uploading a photo to Facebook transmits millions of pieces of information over numerous error-prone network links, yet somehow a perfect copy of the photo arrives intact. Without even knowing it, we use public-key cryptography to transmit secret information like credit card numbers; and we use digital signatures to verify the identity of the websites we visit. How do our computers perform these tasks with such ease? This is the first book to answer that question in language anyone can understand, revealing the extraordinary ideas that power our PCs, laptops, and smartphones. Using vivid examples, John MacCormick explains the fundamental "tricks" behind nine types of computer algorithms, including artificial intelligence (where we learn about the "nearest neighbor trick" and "twenty questions trick"), Google's famous PageRank algorithm (which uses the "random surfer trick"), data compression, error correction, and much more. These revolutionary algorithms have changed our world: this book unlocks their secrets, and lays bare the incredible ideas that our computers use every day.