What has sparked Rain and Emily off this time? Could it be an actual electrical encounter? And why does her older brother sound like a duck? Its fun to the power of four, as our scatty schoolmates seek solutions to queries like how do X-Rays work? What is a Brocken bow and how is it different from a rainbow? And what do camels and ships have in common? To discover these details, and more, join the gang. Hurry! The bell"s about to ring!