Rubber band propelled aeroplane
Tight rope walking acrobats
Periscope
Water rocket
Balloon on nails
Mousetrap car
Lemon battery
Catapult
Making a battery
Simple traffic lights
Buzzer 1
Buzzer 2
Paper loudspeaker
Air powered rocket
Simple ammeter
A three way switch
Newton’s cradle
Solar water heater
Cardboard Solar oven
Hydraulic arm 1
Hydraulic arm 2
Hydraulic arm 3
Marble roller coaster
Hydraulic judobots
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