Best Selling Books by David Glover

Can you make a bridge out of spaghetti? Why do jellies wobble? Can you make star-shaped bubbles? Why are windows made of glass? Discover the answers to these questions and more in these fantastic experiments that cover everything from testing which materials are waterproof to making a bubble diver *Friendly characters will take your child on an exciting and fact-filled journey of scientific discovery *Safety tips and notes to parents feature throughout *At the end of each section is a quiz, to test your child''s understanding *Appended to the book is a glossary and index --- From the Publisher

Discover an exhilarating world of learning by solving a series of mathematical problems. Finding the answers will enable readers to advance through an exciting adventure story.

Examines the composition and strength of materials, both solid and liquid, and features experiments, including chemical reactions.

Discover what makes machines work, from a popcorn dispenser to a marble-operated clock.

This title explores the world of digging machines by explaining the kinds of jobs they do, along with the various parts that they are made of.

Looks at airplanes and helicopters, what they do, the parts they have, how they fly, how they take off and land, and the safety precautions people take when flying in them.

This book deals with an agricultural production and marketing system known as contract farming (CF). In this system, a public or private agency purchases the crops of independent farmers through contracts, often providing inputs, technical assistance and marketing. CF has a long history in developed countries and has spread to the Third World. The book uses case studies from North America, Latin America and Africa to assess the experience to date and provide guidelines for the use of CF in the future.

Discover an exhilarating world of learning by solving a series of mathematical problems. Finding the answers will enable readers to advance through an exciting adventure story.

Introduces young readers to the world of sound, from a sonic boom to the faintest of echoes.