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Your kid is in school, and he began to teach already shot. This is for him well, just rocket science, and that it would not spoil the desire to learn and to do everything possible that it would become clear that such a fraction, you're trying to hook or by crook to explain to him. And a great idea try to do it in the game. Only in the game it will be interesting and will certainly be useful. After all, a lot to learn, and learn.