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Scavenging energy on the radio waves
New research shows that energy could be extracted from the wifi waves that surround us, write ROX MIDDLETON, LIAM SHAW and JOEL HELLEWELL
Radio City Tower viewed from across the Mersey with Albert Dock in the foreground

IF YOU use wireless internet, you may have noticed that there is a lot of it around.

Almost every square metre of space in cities is covered by multiple wifi router ranges.

The proliferation of overlapping, jealously password-protected wifi provision rakes in profits for internet companies that are able to charge several separate people who could instead share the cost and use of a single wifi router.

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