How scientists find out how things work: First a scientist pulls together all the observations about something. Next, he or she thinks up a question that the observations don't explain. Then a hypothesis, that which someone believes to be the correct answer to the question is formed. It must be a statement that can be tested. Next, an experiment is made to test the hypothesis in which everything that happens is written down. Finally the scientist...

In 1992, Dr. Mae Jemison made history by spending eight days in Earth's orbit, making her the first black woman ever to visit space. Twenty years later, Dr. Jemison is pushing space travel forward again with her 100 Year Starship Foundation. In this new True Book series, readers will join Dr. Jemison as she guides them on a tour of our solar system and explains how astronomers have used technology to discover new stars and planets. "This book explains...

From the tall peaks of the Rocky Mountains to the rolling hills of the Intermontane Basin to the rushing waters of the Colorado River, Colorado is full of natural beauty. Readers will take a tour of this incredible state. They will get a chance to see the natural landscape, find out how people live in Colorados towns and cities, learn about the states history, and much more.

"This book details the history, culture, geography and government of Texas."--Provided by publisher.

"This book details the science of light. It explains where this energy comes from, how it affects life on Earth, what uses people have found for it, and more."--

"Introduces the reader to women's rights movement"--