Pedometer

Used in modern times to count the number of steps a wearer takes, the pedometer dates back to the era of Thomas Jefferson and possibly da Vinci. Studies conducted by Dr. Yashiro Hatano of Japan between 1965 and 1985 suggest that the optimal number of steps needed per day to balance caloric intake and physical expenditure is 10,000. Pedometer apps are now found in everyday gadgets like Apple's iPod nano and the Nintendo DS.

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