Best Selling Books by Sally M. Walker

Discusses the physical characteristics, behavior, and habitat of the jaguar, and describes the efforts to protect this endangered species.

Discusses the physical characteristics, behavior, and habitat of the common and pygmy hippopotamus, and describes efforts to protect these animals from poachers and other threats.

The ideal resource for K-8 teachers, school librarians, event coordinators, public and children''s librarians, and after-school program librarians. Arranged day by day from August 1, 2000, through July 31, 2001, it will help teachers plan lessons, arrange bulletin boards, and prepare school calendars.More than 4,000 entries include updated birthday listings of entertainers, athletes, and government officials that are of interest to children, all federal and state holidays, significant dates in American history, state fairs, space exploration milestones -- even dates that toys such as Beanie Babies "TM" and American Girl "TM" dolls were introduced.

Describes the hydrologic cycle and its importance to life on Earth.

What is work? You may think work is doing chores or going to a job, but you do work every time you move something from one place to another. With experiments that demonstrate these fundamental concepts, discover how you work, and how simple machines make doing work easier.

Learn about pulleys, what they are, what they do, and how they work.

What causes sound? How does sound travel? Sound begins when matter vibrates. Without this vibration sound could not move and nothing would make any noise. Starting with tiny molecules, this book explains the main concepts of sound and furthers understanding through a series of easy-to-do experiments that will appeal to readers of all ages.

Where does electricity come from? How does it make a computer run or a light bulb shine? Electricity is a form of energy that can be used in many ways. Starting with the tiny particles that make up atoms electrons, protons, and neutrons this book highlights the basics of how electricity works and furthers understanding through a series of easy-to-do experiments.

What are magnets? Why are magnets found inside machines such as televisions, radios, and telephones? What do atoms and the tiny particles that make up atoms protons, neutrons, and electrons have to do with magnetism? Magnets provide forces that have the power to push or pull other objects. Easy-to-do experiments help readers explore the central principles of magnetism.

What is matter and where can it be found? Everything in the world is made of matter, whether it is a solid, a liquid, or a gas. Important ideas about matter such as volume, mass, and how matter changes state are conveyed through a series of easy-to-do experiments.

Learns about the screw, the physics behind it as well as its applications.

What do a doorstop, a butter knife, and the front of a boat have in common? All of them are wedges!

What do bicycles, doorknobs, and screwdrivers have in common? All of them use wheels and axles to perform work!

What do staircases, dump truck beds, and ramps have in common? All of them are inclined planes!

What do jar tops and water-bottle lids have in common? Both of them are screws!

When British troops near their farm, Letty Wright and her family must escape and leave all their possessions behind including Letty''s pet goose Solomon, and Letty hastily writes a note imploring the soldier''s to spare Solomon''s life. Reprint.

What do flagpoles and some window blinds have in common? They use pulleys to perform work!

Describes the types of sedimentary rocks, and the processes that lead to their formation.