Explains the nature and causes of a sore throat, discusses the immune system, differentiates between strep throat and tonsillitis, and describes how to treat a sore throat.
Describes the physical structure and functions of the brain and the nervous system. Also discusses various mental disorders, their causes, and their treatment.
Describes the composition and function of the human skin and the inner linings of the body as well as such animal coverings as feathers, furs, and scales.
Discusses plate tectonics, the theory that the surface of the earth is always moving, and the connection of this phenomenon to earthquakes, volcanoes, and tsunamis.