"Free Electricity"
It is a mechanical problem that has troubled scientists since the ancient Greeks. Now a Scottish electrician has invented a small water wheel that could save thousands of pounds in energy bills.
Ian Gilmartin, 60, who has no mains electricity, is generating power from the stream in his garden. He and friend Bob Cattley, 58, have invented a mini water wheel capable of supplying enough electricity to power a house, with no running costs and zero carbon emissions.
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