Explores the history of cryptography and codes, discussing a variety of different kinds of codes and ciphers, as well as how codes have been used by militaries throughout the world.
This revealing book traces codes throughout history, from an encryption device used by the Spartans in 400 B.C. to the Enigma Code of the 1940s, pausing to consider coded military secrets and newspaper scoops alike. Students will be delighted by code-cracking diagrams.
Brimming with engaging facts and detailed illustrations, this book outlines an impressive array of earthquake related topics. Readers will learn about measuring earthquakes, earthquake-proofing in modern buildings, and the details of some of the worst earthquakes in history.
This book discusses the problems of Earth's environment, describing deforestation, rising sea levels, acid rain, floods, drought, alternative energy, and the greenhouse effect.
This book discusses medical technology and improved medical treatments, describing emergency equipment, imaging of internal organs, drugs and nutrients, surgery, replacement parts, transplants, and research.