What is magnetism?What is a magnetic field?What are a magnet's poles?You can find the answers to these and other questions about magnets in Why Do Magnets Attract?

Why do swings swing?Why do swings stop swinging?What makes things change direction?You can find the answers to these and other questions about movement in Why Do Swings Swing?

What makes up our galaxy?What is the Milky Way?What is the solar system?You can find the answers to these and other questions about the planets and stars in Why Do the Stars Shine?

What is a fossil?What are minerals and metals?How are mountains formed?You can find the answers to these and other questions about Earth in Why Do Volcanoes Erupt?

These Audio CDs contain a recording of all the material from the books from levels 3-4.

Why do spiders live in webs? Where do otters sleep? Why do bees make hives?