Utilizing easy-to-find and inexpensive materials, this handy resource teaches desktop warriors how to build a multitude of medieval siege weapons for the modern era. Novice combatants will learn to build 35 defense weapons, including a marshmallow catapult, a chopstick bow, a bottle cap crossbow, and a clothespin ballista. In addition to beefing up their Dark Age arsenal, would-be warriors are provided with a number of targets on which to practice...

Part philosophical ponderings on humanity's relationship to the universe, part scientific extrapolation on what technological advancement might bring to that understanding, this long essay, first published in Century Illustrated Magazine in June 1900, is yet another example of the genius of Serbian inventor NIKOLA TESLA (1857-1943), the revolutionary scientist who forever changed the scientific fields of electricity and magnetism. ABOUT THE AUTHOR: Nikola...

Este libro está escrito para ti, curioso de cualquier edad. Esta es una de las primeras líneas de El mundo de Max. La ciencia para todos. Vive con Max sus aventuras y descubrirás a través de sus ojos que el mundo está lleno de maravillas. Aquí encontrarás las explicaciones a muchas cosas que suceden a tu alrededor y además podrás comprobarlas tú mismo con los numerosos experimentos sobre la materia, la energía, la luz, la percepción, la...

Written for reasonable risk takers and suburban dads who want to add more excitement to their lives, this daring combination of science, history, and DIY projects explains why danger is good for you and details the art of living dangerously. All of the projectsfrom throwing knives, drinking absinthe, and eating fugu to cracking a bull whip, learning baritsu, and building a flamethrowerhave short learning curves; are human-focused, as opposed to technology-centric;...

A man's home is his castle, or so the saying goes, but could it withstand an attack by Attila and the Huns, Ragnar and the Vikings, Alexander and the Greeks, Genghis Khan and the Mongols, or Tamerlane and the Tartars? Backyard Ballistics author William Gurstelle poses this fascinating question to modern-day garage warriors and shows them how to build an arsenal of ancient artillery and fortifications aimed at withstanding these invading hordes. Each...

Culling common household items to create an uncommon arsenal of miniature gadgets and side arms, this guidebook provides do-it-yourself spy enthusiasts with 35 different surveillance tools and weapons. From a mini-catapult in a breath-mint tin to milk-jug cap blow-dart wristwatches, this handbook details how to achieve clandestine ends practically and inexpensively. In addition to creating weapons such as periscopes, bionic ears, and grappling hooks,...

This book is ideal for high school & engineering students as well as hobbyists who have just started out building projects in Electrical and Electronics fields. The book starts with electrical and electronics fundamentals necessary for execution of projects. The basic knowledge is introduced first followed by a schematic diagram, components list and the theory behind the project to be performed is given. The projects have been divided into three segments...

Este libro tiene como objetivo la divulgación científica de forma comprensible para cualquier persona, independientemente de su formación previa. Está especialmente pensado para niños y jóvenes de edades comprendidas entre los 10 y 16 años y recoge un amplio espectro de temas de interés, como son la Tierra, el cuerpo humano, la biología, la física y química, la tecnología o las matemáticas. Javier Fernández Panadero es licenciado en...

The Magical Word of Science focused on children mainly between 9-15 years old, who like to do simple experiments and experience the wonders of Science. The book contains 100 experiments that can be easily done at home, which enables children to better undertstand the phenomena of physics, chemistry and biology. The experiments can be easily done by using simple things found in the home. The tasks in the book can be divided into three categories based...

Cómo los grandes científicos recurrieron a la figura del Demonio para avanzar en sus teorías y revolucionar el mundo. Desde los comienzos de la ciencia, la palabra «demonio» empezó a usarse para designar algo que rompía con nuestra comprensión de la naturaleza. A estos enigmas se les distinguió con el apellido del científico que se topó con ellos y que emprendió un viaje hacia lo desconocido, intentando comprenderlos mejor. El llamado...