Here are some photos of us trying to blow a piece of tissue into a bottle goal. We thought that if you blow very hard (like kicking a football) that it would be easy to score a goal, but in fact, the trick to scoring is to blow very gently right at the ball. Otherwise the air that you blow goes round the ball, hits the back wall of the bottle, and bounces out again, taking the tissue ball with it. This looks like a trick, but actually it is based on Science - air hitting a hard object will bounce off it, and change direction, just like sound waves, or light rays bouncing off shiny surfaces.
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