Explains how the sense of sight works; discusses judging distance, color, animal eyesight, and problems with sight; and includes instructions for finding one's blind spot.
Explains how the sense of taste works, describes the different tastes humans and animals can detect, and discusses how taste can be used to protect a person from dangerous substances.
Explains how the sense of smell works; discusses how it affects taste, warning smells, animal noses, and other related topics; and includes a related activity.
Explains how the sense of hearing works; describes ears; discusses animal hearing, sounds, problems with hearing, and other related topics; and includes a related activity.
Examines some of the interesting and controversial developments and theories in modern science, focusing on the search for inexpensive, renewable energy sources, with discussion of biopower, and wind, wave, solar, geothermal, and nuclear energy.
Examines issues related to water, including the different sources, wastewater, pollution, droughts, the problem of supplying clean water to the world's increasing population, and more.