Germs are all around us, but they're too small to see. Many germs are harmless, but two kinds, viruses and bacteria, can make you sick! How? Read and find out! This classic Level 2 Let's-Read-and-Find-Out picture book is all about germs, how they can make you sick, and how your body works to fight t...

People have taken dangerous risks trying to fly. Some inventors built wings for their arms and flapped them like birds. Others tried to fly with balloons or tried to glide with the wind. This book describes the creative, fascinating, and wacky experiments that people tried before the airplane was in...