Book excerpt: The bestselling book for every boy from eight to eighty, covering essential boyhood skills such as building tree houses*, learning how to fish, finding true north, and even answering the age old question of what the big deal with girls is. In this digital age there is still a place for knots, skimming stones and stories of incredible courage. This book recaptures Sunday afternoons, stimulates curiosity, and makes for great father-son activities. The brothers Conn and Hal have put together a wonderful collection of all things that make being young or young at heart fun—building go-carts and electromagnets, identifying insects and spiders, and flying the world's best paper airplanes. The completely revised American Edition includes: The Greatest Paper Airplane in the World The Seven Wonders of the Ancient World The Five Knots Every Boy Should Know Stickball Slingshots Fossils Building a Treehouse* Making a Bow and Arrow Fishing (revised with US Fish) Timers and Tripwires Baseball's "Most Valuable Players" Famous Battles-Including Lexington and Concord, The Alamo, and Gettysburg Spies-Codes and Ciphers Making a Go-Cart Navajo Code Talkers' Dictionary Girls Cloud Formations The States of the U.S. Mountains of the U.S. Navigation The Declaration of Independence Skimming Stones Making a Periscope The Ten Commandments Common US Trees Timeline of American History * For more information on building treehouses, visit www.treehouse-books.com and www.stilesdesigns.com or see "Treehouses You Can Actually Build" by David Stiles