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In a book full of compelling investigative science and mystery, narrative nonfiction master Walker tells a tale of loss, restoration, and the triumph of human ingenuity as she chronicles the near-extinction and dramatic recovery of the iconic American chestnut tree. Photos.

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The worst maritime disaster in American history wasn't the Titanic. It was the steamboat Sultana on the Mississippi River — and it could have been prevented.In 1865, the Civil War was winding down and the country was reeling from Lincoln's assassination. Thousands of Union soldiers, released from Confederate prisoner-of-war camps, were to be transported home on the steamboat Sultana. With a profit to be made, the captain rushed repairs to the ...

On December 6, 1917, two ships collided in Halifax Harbor in Nova Scotia, Canada. One ship was loaded top to bottom with munitions and the other held relief supplies, both intended for war-torn Europe. The resulting blast flattened two towns, Halifax and Dartmouth, and killed nearly 2, 000 people. As if that wasn't devastating enough, a blizzard hit the next day, dumping more than a foot of snow on the area and paralyzing much-needed relief ef...

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. One of America's most enduring boundaries is the Mason-Dixon Line, most associated with the divide between the North and the South and the right to freedom for all people. Sibert Medal-winning author...

Fossils give us a window to the past. Water, sediments, and pressure work together over time to preserve the shape of things that lived long ago. Studying these ancient plants and animals tells us more about our own existence. Have you ever searched for fossils? Unearth some in this book.

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 to research rocks and what they can teach us about our world.

Minerals are fascinating resources that have a variety of uses. A diamond is a mineral that is sought after for its beauty. Salt is a useful mineral that adds flavor. But do you know what minerals are made of? Or how to identify a mineral? Explore the amazing world of minerals in this book.

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Soil can be found almost everywhere on Earth. Sand is a soft soil that is found in deserts. Loam is soil that is great for growing plants. But how are these types of soils different? And how are they made? Explore the amazing world of soil in this book.

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When Letty and her family must flee the farm in 1778 as British soldiers approach, she scribbles a desperate note begging for the life of her beloved goose, Solomon. Full color.

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.

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.

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 atomsprotons, neutrons, and electronshave 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.

Where does light come from? What do colors have to do with light? Light is a form of energy. Life on earth is made possible because light from the sun carries heat to the earth. This book explores the essential concepts of lightphotons, color, refraction, light rays and waves, etc.through a series of easy-to-do experiments readers will enjoy doing.