Presents information on how to get energy from food and what happens along in the digestive system.

Food is the body's fuel—but what happens to each yummy mouthful from the moment you take a bite? The Stickmen unravel the long process of digestion carried ou

Just think - everything you do (and think!) - is handled by the extraordinary computer inside your head. Your heart beats more than once every second. Ber-boom.

Ba-boom, ba-boom, ba-boom . . . your incredible heart beats more than once every second, no matter what you're doing. And your lungs pull in up to 145 gallons o

Muscles help you run, jump, play sports, and even sit still long enough to read this book. Your bony skeleton holds you up and keeps everything in its place. Le