make a hovercraft

You'll need:

An old cd
a balloon
a bottle top that opens and closes- like the ones off water bottles
a glue gun.

Glue the lid onto the the cd over the hole in its middle. When the glue is dry inflate a balloon ( make it nice and big) and put it over the end of the bottle lid shutting off the lid so that the balloon stays inflated. Sit the 'hovercraft' on a flat surface and carefully open the bottle lid. As the air comes out of the balloon the cd will slide all over the place- heaps of fun!