Balloon Rockets

What you need; 

Balloon

Balloon pump (optional)

String

Sticky or masking tape

Straw 

What to do; 

Put string up, I put it right across the room, but then it depends how big your room is. But how far you want the string is your choice. 

Be sure to put the straw on the string before putting it up. 

Blow or use a balloon pump to pump the balloon up, how big you want the balloon depends on how long the string is. 

And then stick the balloon to the straw with the open end facing the opposite direction you want the balloon to go, as that's the rocket that make the balloon go. 

And then you let it go and watch it fly across the room