"This book explains how astronomers discover new planets"--Provided by publisher.

"Learn all about unmanned aircraft, or drones, including how they were invented and improved over time, what they are used for today, and why they have sometimes caused controversy"--

Briefly discusses the international competition in winter sports, beginning with the Nordic Games in 1908, and describes some of the sports involved, including skiing, ice hockey, skating, and bobsledding.

Presents general information about paleontologists, what they learn about prehistoric animals and vegetation by studying them.

Learn about the bloodiest battles and darkest days in our nation's history.

Explains what geology is, shows how the Earth itself and rocks change, and looks at how geologists study the polar regions and outer space.

"This book details the history, current uses, and potential future applications of geothermal energy."--

An exploration of the Iroquois Indians, discussing the nation's housing, relationship with settlers, culture, and more.

An illustrated introduction to constellations that explains how constellations are useful, who discovered them, and related topics.