
Have you ever noticed that magnets only stick to your refrigerator because of their metal backing? That's called magnetism In this volume, readers learn how magnetism works, from a magnet's north and south poles to the invisible magnetic fields around different objects. They...

Have you ever noticed that magnets only stick to your refrigerator because of their metal backing? That's called magnetism In this volume, readers learn how magnetism works, from a magnet's north and south poles to the invisible magnetic fields around different objects. They...