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... In fact, you probably already use mnemonics more often that you realise. Don't believe it? Okay, here's another question for you: what are the colours of the rainbow? Hold your mouse here for the answer Again, not the most difficult question in the world, but most of you probably started saying: Richard of York gave battle in vain to try and remember. If you did, then you've just used another mnemonic - see, they're easy, aren't they? The idea is to make them work for you. So, if you need to know the planets in order, take the initial letter of each of them and make up a silly sentence. For example: Wayne Rooney looks all but out of the World Cup as Sven-Goran Eriksson admits the star needs a "miracle'' to be fit for next month's event in Germany. England boss Eriksson has been promised an update from Manchester United on Thursday. But, at the moment, he plans to name Rooney in his 23-man squad on Monday and then keep his fingers firmly crossed. Eriksson said: "I knew yesterday that he had more than one fracture. That's what I heard. "I don't know what that means but I'm not that pessimistic. I'm born that way. "Miracles happen in life now and then, but I don't really know.'' When pressed on whether Rooney now needs a miracle, Eriksson, who was...