Its humorous title begins with the punch line of a classic joke about someone who is baffled by technology. It was written by a 40-year computer veteran who wants to take the mystery out of computers and allow everyone to gain a true understanding of exactly what computers are, and also what they are not. Years of writing, diagramming, piloting and editing have culminated in one easy to read volume that contains all of the basic principles of computers written so that everyone can understand them. There used to be only two types of book that delved into the insides of computers. The simple ones point out the major parts and describe their functions in broad general terms. Computer Science textbooks eventually tell the whole story, but along the way, they include every detail that an engineer could conceivably ever need to know. Like Momma Bear's porridge, But How Do It Know? is just right, but it is much more than just a happy medium. For the first time, this book thoroughly demonstrates each of the basic principles that have been used in every computer ever built, while at the same time showing the integral role that codes play in everything that computers are able to do. It cuts through all of the electronics and mathematics, and gets right to practical matters. Here is a simple part, see what it does. Connect a few of these together and you get a new part that does another simple thing. After just a few iterations of connecting up simple parts - voilà! - it's a computer. And it is much simpler than anyone ever imagined. But How Do It Know? really explains how computers work. They are far simpler than anyone has ever permitted you to believe. It contains everything you need to know, and nothing you don't need to know. No technical background of any kind is required. The basic principles of computers have not changed one iota since they were invented in the mid 20th century. "Since the day I learned how computers work, it always felt like I knew a giant secret, but couldn't tell anyone," says the author. Now he's taken the time to explain it in such a manner that anyone can have that same moment of enlightenment and thereafter see computers in an entirely new light.

    Called by some, "the theory of everything," superstrings may solve a problem that has eluded physicists for the past 50 years, the final unification of the two great theories of the twentieth century, general relativity and quantum field theory. Now, here is a thoroughly revised, second edition of a course-tested comprehensive introductory graduate text on superstrings which stresses the most current areas of interest, not covered in other presentations, including: - Four-dimensional superstrings - Kac-Moody algebras - Teichm�ller spaces and Calabi-Yau manifolds - M-theory Membranes and D-branes - Duality and BPS relations - Matrix models The book begins with a simple discussion of point particle theory, and uses Feynman path integrals to unify the presentation of superstrings. It has been updated throughout, and three new chapters on M-theory have been added. Prerequisites are an acquaintance with quantum mechanics and relativity.

     He ordered a superhuman effort to make Britain a nuclear power. Although Britain had been a junior partner in the Manhattan Project which had produced the American bombs, no British scientist had more than partial knowledge of the complex physics involved. The war over, the Americans cut off all help. At a time of daunting economic difficulty and amid the growing tension of the Cold War, the project hurriedly took shape behind a cloak of almost paranoid secrecy and in an atmosphere of constant stringency and shortage. Brian Cathcart’s book ranges over politics, diplomacy, espionage and science, but above all it tells the story of the brilliant young scientist William Penney, his team and their struggle. The men who worked behind the security fences at Aldermaston have been allowed to speak. The tales include fearsome risks, vast resourcefulness, bureaucratic obstruction, naval intransigence and a measure of black humour. The veil is also lifted on the extraordinary contribution of Klaus Fuchs, the Soviet spy. Finally the high drama of the test itself, conducted off the coast of Australia after a naval operation which came close to total fiasco, is recounted in gripping detail. Test of Greatness draws on what at the time the book was published were newly declassified documents. Cathcart also speaks uses primary sources, such as the words of the participants, illustrating and illuminating in vivid, human terms a secret but crucial chapter of post-war British history. Praise for Brian Cathcart: ‘The story of the British bomb mixes science, politics, espionage, Essex and morality. A nation is changed for ever when it decides to become a nuclear power. Brian Cathcart takes this complicated array of factors and makes them rise out of the page and walk to a very wide audience.’ – Sir Peter Hennessy, military historian Brian Cathcart was Assistant Editor of the Independent on Sunday when he wrote Test of Greatness. Since then he has taken up a position at Kingston University London and founded Hacked Off in the aftermath of the tabloid phone-hacking scandal. He has just published his eighth book, The News from Waterloo. His previous works include accounts of the murders of Jill Dando and Stephen Lawrence.

    Each sketch contains Questions and Projects to help you learn more about its topic and to see how its main ideas fit into the bigger picture of history. The 25 short stories are preceded by a 56-page bird's-eye overview of the entire panorama of mathematical history, a whirlwind tour of the most important people, events, and trends that shaped the mathematics we know today. Reading suggestions after each sketch provide starting points for readers who want to pursue a topic further."