Explains the development of our system of numbers, place value, and why numbers are used.

A basic introduction to plants with simple discussions of algae, fungi, roots, stems, leaves, flowers, and seeds, and including pertinent experiments.

Describes how a river begins and grows and how it influences the land that it flows through. Also discusses the many ways people use rivers and the importance of keeping them clean and unpolluted.

Includes brief discussions and experiments about force and motion, gravity, magnets, energy and motion, wheels, pulleys, and gears.

Describes the physiology, habits, and behavior of snakes.

Describes the operation and uses of a vehicle that can go back and forth between earth and an orbit in space.

Describes the weather conditions that produce storms and the damage that can be done by rain, snow, wind, dust, ice, thunder, lightning, and hail.

Presents various methods of telling time by using such instruments as the shadow stick, sundial, candle clock, rope clock, water clock, hourglass, and the modern clock.

"Presents ten experiments involving heat, wind, air, and water which demonstrate how these elements are related to weather."--Title page verso.

An introduction to zoos and the animals that live in them, including the elephant, rhinoceros, giraffe, antelope, lion, and giant panda.