Each book in this series provides an introduction to an aspect of the natural or scientific world, here night-time, with lots of information to help answer children's questions about the world around them. They contain safe and easy experiments to help clarify explanations.Each book in this series provides an introduction to an aspect of the natural or scientific world, here night-time, with lots of information to help answer children's questions about the world around them. They contain safe and easy experiments to help clarify explanations.