Why do Americans love a bell that no longer rings? It is the Liberty Bell, and it once rang to announce the birth of a new country, the United States. Find out why Americans still treasure the bell, along with its famous crack.

Soil is a fundamental and critical, yet often overlooked, component of terrestrial ecosystems. It is an extremely complex environment, supporting levels of diversity far greater than any ecosystem above ground. This book explores how soil structure develops and the consequences this has for life underground. The effects of spatial arrangement, of soil 's physical and biological components on their interaction and function are used to demonstrate their roles in ecosystem dynamics. Bringing together existing knowledge in the areas of soil biology and physics, this book explores the key characteristics of soil spatial architecture.

Explore the training needed to become a computer game developer, a lucrative and exciting career. Also gives readers a chance to examine how computer games are created - from an idea to a finished product. Ages 12+