I was recently having dinner with a friend and looked down at his forearm, only to find a light-colored streak running up, or down, his skin. I looked at him, looked at his arm, looked at him, and then we laughed for about thirty minutes. He was embarrassed; I was glad we decided not to share French fries.
Not that I really needed to worry—he had washed his hands, he just missed his arm. And according to a new study, women actually carry far more varities of bacteria on their hands then men.
But why?
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