Climate change - What happens to the water level when floating ice melts?
Heat conservation - Which type of fabric will stop a block of ice from melting quickly?
Trapping solar energy - At which angle, relative to the sun will a solar car run the fastest?
Storing energy - Which type of spring will release the most energy?
Wind power - What shape of sail will make an aluminium boat move the fastest?
Younger or older? - Do younger people have a better sense of taste than older people?
Floating or sinking? - What is the best shape to fold a piece of aluminium foil to float a heavy load?
Types of batteries - Do the cheaper batteries last as long as the more expensive ones?
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