Cut and stick two straws together to make a T-piece. Put the upright in some water and blow.
Sneezes are like mini explosions.
You shoot the air from your nose so hard it can come out at 40 metres per second, firing bits of snot and germs into the air. So if you have a cold you can easily infect everyone in the room. Hosepipe fun Put your thumb over the end of the garden hose in different positions to get different shaped sprays. Pinch the end of the hose for two squirts. Jetting off Build your own jet-powered airbus.