Abstract
How could you use a vacuum cleaner and a few pieces of plastic drainpipe to fire a projectile 25 metres into the air? How could you listen to a radio while wearing ear defenders? And how could you use a small electric motor and a piece of dowel fixed to a wooden base to make small washers appear to defy gravity? The answers to these questions, together with full construction details, appear in this fascinating new book by physicist Neil Downie.
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