Louise F writes:
Every time I pass this sign in Tesco, Cabra [Dublin], it annoys me. From my rudimentary knowledge of the laws of physics I think it’s impossible for something to create more energy than it uses as in a fixed system like this store. Energy cannot be created or destroyed it can only be converted from one form to another. Surely this sign is wrong then? But even if I’m wrong about this the sign is very annoying.
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