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And don't forget to keep up your brain in shape by playing mind power games- crosswords, sudoku, draughts, scrabbles, etc.etc. Don't use calculator when possible, etc. It interesting because nowadays in western countries there are technologies for everything. People do or figure out things less for themselves and have the gadgets, computers, etc. think for them. Challenge yourselves, do tests and don't forget walk! It pumps up blood in your brain.