Surveys the different holidays celebrated throughout the year by the early settlers in America and describes some of the various activities, sports, and toys with which they amused themselves.
Discusses how such principles of physics as force, gravity, and momentum apply to a variety of athletic actions, with experiments for the reader to try.
Defines what an allergy is and how it can affect skin, respiratory tract, gastrointestinal tract, ears, eyes, and mouth. Discusses different types of allergies, causes of allergic reactions, and treatments.
Text and accompanying photographs examine fish, reptiles, mammals, and other animals with backbones, noting both their similarities and their differences.
Describes radio astronomy and how it helps scientists study the universe. Shows how radio telescope enabled astronomers to map out the heavens to reveal the existence of pulsars, nuetrons, and black holes.
Text and photographs discuss the processes by which scientists determine the age of their specimens, such as counting the number of tree rings, reading the strata, and using chemical analyses and the Carbon-14 test. Also looks at recent findings that may tell us how old the universe is.
