The science of

Bread is a staple food in many countries. Just a few simple ingredients--flour, yeast, and water--become a crusty, tasty loaf in the oven. Learn about the physical and chemical changes that happen between the mixing bowl and the serving plate.

While the dinosaurs roamed the Earth, another species ruled the skies. These were the pterosaurs. They weren't birds, but flying reptiles. They were expert flyers, swooping, soaring, and gliding through prehistoric skies. They were magnificent hunters, too, diving for fish, snapping up insects in the air, or dining on baby dinosaurs. In this book readers will discover all about these awesome creatures, how they lived, how they hunted, and why they...

Everyone poops. It may seem pretty gross, but it's perfectly healthy and natural. Poop (also called feces or excrement) is the solid waste that's left after we've digested our food. It's the stuff our bodies can't use for energy or growth, and it passes out of us when we go to the toilet. So poop is really just the final product of our digestive system. In this gut-wrenching guide we will explore how we digest our food, and all the strange side effects...

Breathe in, breathe out ... We all do it, every day and every night. Breathing is essential for life. It brings oxygen (a gas in the air) into our lungs. We need oxygen to keep our brains and bodies working properly. Without it--without breathing--we would die very quickly! This breathtaking guide to breathing explores the process of breathing and how disgusting substances like mucus and snot have unexpected uses.