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Writing This Makes Me Itch...

Consider this Extraordinary Info of the Day (June 6, 2009):

Every square inch of the human body has an average of 32 million bacteria on it.

Your Task: Calculate the number of bacteria currently on your skin...is it in the millions, billions, or trillions? You will first have to estimate the surface area of your skin...and try to be quite close with your estimate, remembering that every square inch above or below the true value involves a factor of 32 million bacteria.