physiology

Dr. Sherwin B. Nuland provides an optimistic perspective on aging, discussing the bursts of creativity, perceptiveness, and spiritual intensity that often accompany aging and examining research into extending life.

Examines the genetics that dictate the differences between men and women and includes discussions on the differences in psychology and physical attributes.

Explains how fish get oxygen from water using their gills.

Explains how fish get oxygen from water using their gills.

Discusses the changes that take place in a boy's body during puberty, including information on the body's changing size and shape, the growth spurt, reproductive organs, pubic hair, beards, pimples, voice changes, wet dreams, and puberty in girls.

Informative text, photographs, and real-life stories describe brain injuries and how they are treated and offer tips on protecting the brain.