• The metal inside makes the power and when the springs hold it tightly it pushes the power. Justin Corbin, grade 3, Edgelea • They put a hamster in it to start things.

This is one of those cool "so-thats-how-it-works" projects that is an easy weekend activity to teach yourself (or your kids) the basics of how a battery operates. Basically, you need to sand down ...

Ever wondered what exactly is inside your notebook's battery pack? We take the cover off a typical example, and explain how it can, occasionally, burst into flames.