Graham Rickard

A simple history of Norman castles describing their origins, how they were built, the defense of the castles, and daily life within the castle walls.

Discusses how today's modern wind turbines have developed from the windmills of the past and how technology relating to wind power continues to develop.

Explains how the Sun, which is the ultimate source of all energy on earth, can be used to provide electricity and power.

Discusses the mining of silver and its processing into objects with technological, medicinal, industrial, and artistic uses.

Discusses how this common building material is made and used.

Gives descriptions of and an explanation for volcanoes, a history of some famous volcanoes with stories about them, and information on nature's warnings of an eruption and ways to protect oneself.