Scientific american (July 1999)

Cover 1 Table of Contents 2 A Generation of Genius 4 Letters to the Editors 5 50, 100 and 150 Years Ago 7 In Focus 8 Science and the Citizen 10 By the Numbers: Christian Differences 12 Profile: Pinker and the Brain 17 Technology and Business 19 Looking Back at Apollo 24 Cyber View 30 Life's Far-Flung Raw Materials 31 Genetic Vaccines 39 The Mystery of Nucleon Spin 47 The Earliest Zoos and Gardens 53 The Future of Fuel Cells 61 The Electrochemical Engine for Vehicles 63 The Power Plant in Your Basement 69 Replacing the Battery in Portable Electronics 75 The Amateur Scientist: Detecting the Earth's Electricity 81 Mathematical Recreations: The Art of Elegant Tiling 83 Reviews and Commentaries 86 The Editors Recommend 87 Wonders: The Hidden Cosmic Ruckus 89 Connections: A Few Notes 90 Working Knowledge: Aerial Fireworks 92