If we must have the cliched image of a light bulb to represent an idea (Cover, 28 February), can we not at least upgrade to a low-energy bulb?
Tony Harker, University College London.
If we must have the cliched image of a light bulb to represent an idea (Cover, 28 February), can we not at least upgrade to a low-energy bulb?
Tony Harker, University College London.