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Manufacture a toilet block which changes colour when
urinated on. The block could be used to monitor
abnormalities in diet, detect pregnancies or drug test
visitors.
Simon
45730June2003
Design an Auto Butt – a device that would collect
rainwater falling on cars and channel it into the
windscreen-wash bottle or even store it as a reserve
supply for the radiator.
Jack Dolan
4581July2003
