Jean F Blashfield

Defines trace elements and discusses how they affect life on the planet.

Describes the various weapons developed and used during the Civil War, such as longarms, handguns, swords, cannons, naval weapons, and mines, and explores that era as the beginning of modern weaponry.

Examines the role played by cavalry, or horse soldiers, in both the Union and Confederate armies during the Civil War.

Presents the basic concepts of oxygen, the most important chemical element in our lives and also the most abundant element in nature.

Presents the basic concepts of carbon, one of the most important chemical elements found in all living things.

Identifies and tells the stories behind many plants and animals at risk from human action, and describes the political and other factors involved in decisions concerning the various species.