Describes the various parts of the brain and the nervous system and how they function to enable us to think, feel, move, and remember.

Describes the location, nature, development, measurement, and destructive effects of tornadoes, as well as how to stay out of danger from them.

Describes the atmospheric conditions which create thunderstorms, hailstorms, lightning, tornadoes, and hurricanes and how violent weather affects the environment and people.

Describes the nature and work of muscles, the different kinds, and the effects of exercise and other activities on them.