What you need:
- old CD
- glue (hot glue, crazy glue... whatever you have)
What you do:
Put a little glue on the spool.
Stretch the balloon over the top of the spool.
Blow up the balloon by blowing into the hole in the CD.
Set the hovercraft down on a flat surface.
Give it a tap and watch it go.
Newton's laws may be quite complex
but making this hovercraft was EASY!