Sally M Walker
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
What a discovery! Deep under the Atlantic Ocean, divers found a shipwreck like no other. It was the H. L. Hunley, a submarine that had sunk during the Civil War! A team of scientists from all over the world came to work on the discovery. How would they raise the Hunley from the ocean floor? How would they open the submarine? And what would they find inside?
15) Electricity
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.