Walpole, Brenda

Looks at farming techniques and technology, pest and quality control, and the global problem of providing food for the world's population.

Explores the elements of counting, including numerals, ratios, the abacus, and counting rhymes.

This book tells you how salt is taken out of the ground and used in our food.

Presents experiments and tricks to demonstrate movements representing natural forces such as gravity, inertia, and friction, and those made by simple machines.

Discusses the properties of air and gives instructions for a variety of experiments using simple materials.

Explains the many uses of water and how clean water gets to the household tap. Includes instructions for a variety of simple experiments.

Examines environmental problems and solutions in a child friendly way concerning having enough food for everyone. Text supported by facts, figures, case studies and activity boxes.

An encyclopedia of science and technology that explores the human body and shows how the body works, also examines what happens when you become sick and explains the ways medical science is coping with disease and injuries.

Instructions for 175 experiments, tricks, and creations that illustrate the principles of light, water, movement, and air.

Uses a question and answer format to present information about time and the seasons, such as how to split a second, who invented our calendar, and why the moon changes shapes.