How do you harness energy from wind or the Sun? How is food converted into energy? How does a rollercoaster use potential and kinetic energy? Explore key questions and test theories while learning about the properties of energy.

Karen Latchana Kenney was born near the rainforests of Guyana, but moved far north to Minnesota at a young age. She graduated from the University of Minnesota with a bachelor's degree in English and has been writing and editing since. She has worked as an editor at an educational publishing company, but is now a full-time freelance writer and editor in Minneapolis, Minnesota. She has written more than 70 books on all kinds of subjects: from arts and crafts to biographies of famous people. Her books have received positive reviews from Booklist, Library Media Connection, and School Library Journal. When she's not busy writing, she loves biking and hiking with her husband and young son in the many beautiful parks of the state. Visit her online at http: //latchanakenney.wordpress.com/.