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    How many lightbulbs does it take to change a man?
    Description
    27 Apr 09: Cambridge University physicist, David Mackay, debunks some myths about energy saving - unplugging our phone chargers, does not make any appreciable difference - and goes on to show us what will work.
    27 Apr 09: Cambridge University physicist, David Mackay, debunks some myths about energy saving - u... More
    Channel:Telegraph TV
    Copyright 2009
    Tags:SYND, cambridge, David Ma...More
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