Recycled water can be used within certain parts of a household.
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Use bottles of various size and see which ones are easier or harder to sink.
Balls roll in elliptical pathways around the dish, until they fall into the 'gravity well's' central hole.
This area of the gallery is sometimes supervised by Questacon Volunteers, who present a range of simple science demonstrations and logic puzzles to visitors.
Centre of mass can be used to hang objects together.
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