"This book details the life and habits of leeches"--Provided by publisher.

Animals
Endangered species

An introduction to galaxies, which are huge groups of stars.

This excellent addition to the ever popular Questions & Answers series lifts the flap on all kinds of gadgets, systems and ideas. It answers questions such as How does electricity get into our walls? Why do waves go up and down? and Where does money come from? Perfect for every inquisitive child.

"How do bees fly? Why does a spider weave a web? And why are bugs so important to our world? Ada Twist, Scientist: The Why Files is the perfect nonfiction resource for all these questions and more."