You wouldn't want to live without

Though most of them are too small to be seen with the naked eye, bacteria are everywhere. They appeared on Earth more than 3 billion years before the first dinosaurs. Some bacteria cause deadly diseases, but many of them are helpful to us. They fertilize the soil by breaking down dead material, and they are an essential ingredient in many foods. Bacteria in our own bodies are a vital part of the digestive process.--from page 2 of cover.

"Describes what life would be like without bees."--

"Describes what life would be like without math."--

"For thousands of years, nurses have tended to the sick and the wounded. Although they don't get the glory, nurses are just as important as doctors. Read all about the eventful history of nursing and marvel at how nurses today take care of us in the hospital or at home, comfort relatives, cheer us up when we have to stay in bed, and help us make a complete recovery,"--back cover.

"Trees are among nature's most remarkable achievements, growing from a seed you can hold in your hand into a green giant several stories high. Read all about their unbelievably long life spans and how they can live in the most extreme conditions, from baking deserts to icy wastelands. You'll also find out how they provide us with fuel, food shelter -- and even the oxygen that we breathe!,"--back cover.