Sally M. Walker

In 1638, John Lewger made a home in the wilderness of the New World, in a place called Maryland. He named his house St. John's, and for nearly eighty years, it was the center of an ambitious English plan to build a new kind of community on American... Lire la suite

Did witches always ride brooms? No! In fact, long, long ago, witches crept about on tiptoe. On Halloween, they would scare children and cast spells . . . but always from the ground. No witch ever thought of flying—no witch until Druscilla. Druscilla... Lire la suite

On July 28, 1996, two young men stumbled upon human bones in the shallow water along the shore of the Columbia River near Kennewick, Washington. Was this an unsolved murder? The remnants of some settler's or Native American's unmarked grave? What... Lire la suite

YALSA Excellence in Nonfiction for Young Adults Finalist
One of the Best Books of the Year: Chicago Public Library, School Library Journal, Science Books & Films Bright white teeth. Straight leg bones. Awkwardly contorted arm bones. On a hot... Lire la suite

Audisee® eBooks with Audio combine professional narration and text highlighting for an engaging read aloud experience! Electricity powers lights, computers, and television sets. But have you seen how electricity can make objects stick together? Or... Lire la suite

Audisee® eBooks with Audio combine professional narration and text highlighting for an engaging read aloud experience! The sun, furnaces, and ovens all make heat. But have you ever watched matter expand when it is heated? Or seen how different kinds... Lire la suite

Audisee® eBooks with Audio combine professional narration and text highlighting for an engaging read aloud experience! Minerals are fascinating resources that have a variety of uses. A diamond is a mineral that is sought after for its beauty. Salt... Lire la suite

Audisee® eBooks with Audio combine professional narration and text highlighting for an engaging read aloud experience! People, animals, machines, and wind all make sounds. But have you ever seen how sound waves move? Or made a sound wave bounce? Now... Lire la suite

Audisee® eBooks with Audio combine professional narration and text highlighting for an engaging read aloud experience! What do staircases, dump truck beds, and ramps have in common? All of them are inclined planes! Inclined planes are simple... Lire la suite

Rocks can be made of many different minerals. By looking at rocks closely, we can tell where they were formed and what conditions they were created in. How do we know these things? And how do we tell different types of rocks apart? Learn about ways... Lire la suite

Audisee® eBooks with Audio combine professional narration and text highlighting for an engaging read aloud experience! What do bicycles, doorknobs, and screwdrivers have in common? All of them use wheels and axles to perform work! Wheels and axles... Lire la suite

Audisee® eBooks with Audio combine professional narration and text highlighting for an engaging read aloud experience! What do jar tops and water-bottle lids have in common? Both of them are screws! Screws are simple machines. They help us to do... Lire la suite

Audisee® eBooks with Audio combine professional narration and text highlighting for an engaging read aloud experience! What do flagpoles and some window blinds have in common? They use pulleys to perform work! Pulleys are simple machines. They help... Lire la suite

What do staircases, dump truck beds, and ramps have in common? All of them are inclined planes! Inclined planes are simple machines. They help us to do jobs more easily. But don't take our word for it. Put inclined planes to the test with the fun... Lire la suite

What do flagpoles and some window blinds have in common? They use pulleys to perform work! Pulleys are simple machines. They help us to do jobs more easily. But don't take our word for it. Put pulleys to the test with the fun experiments you'll find... Lire la suite

Audisee® eBooks with Audio combine professional narration and text highlighting for an engaging read aloud experience! The sun, lightbulbs, and flickering fires all bring light to our world. But have you ever watched light rays moving? Or seen how... Lire la suite

Audisee® eBooks with Audio combine professional narration and text highlighting for an engaging read aloud experience! Solids, liquids, and gases are the three states of matter. But have you ever made matter change from one state to another? Or seen... Lire la suite

Audisee® eBooks with Audio combine professional narration and text highlighting for an engaging read aloud experience! Fossils give us a window to the past. Water, sediments, and pressure work together over time to preserve the shape of things that... Lire la suite

Audisee® eBooks with Audio combine professional narration and text highlighting for an engaging read aloud experience! You know that magnets hold pictures on a refrigerator. But have you ever found a magnet's north pole? Or turned an ordinary paper... Lire la suite

The Mason-Dixon Line’s history, replete with property disputes, persecution, and ideological conflicts, traverses our country’s history from its founding to today. We live in a world of boundaries — geographic, scientific, cultural, and religious.... Lire la suite