Why do we need forests?Is plastic harmful?Where are gold and gems mined?You can find the answers to these and other questions about the world's resources in Why Do Diamonds Glitter?

Are all birds able to fly?Is a dolphin a mammal?Where do lemurs come from?You can find the answers to these and other questions about animals in Why Do Monkeys Chatter?

What is light? What is white light?What is a polar night?You can find the answers to these and other questions about light and shade in Why Do Shadows Change?

Why are some clouds so dark?Why does lightning strike?What is a tornado?You can find the answers to these and other questions about weather in Why Does Thunder Clap?

Why do I hear thunder after I've seen lightning? What is sound?How do our ears hear sound?You can find the answers to these and other questions about sound in Why Is It So Loud?

A series of twenty non-fiction science readers which engages children in the world around them. These Audio CDs contain a recording of all the material from the books from levels 5–6.