Your body is literally crawling with your own personal bacteria. As horrifying as it sounds, it is actually OK--and necessary for your health--to have this thin film of germs on your skin. Bacteria don't like other bacteria encroaching on their turf, says Dr. Donald Low, microbiologist-in-chief at Toronto's Mount Sinai Hospital. It's nature's antibacterial system: when new bacteria arrive, the ones already living happily on your hands excrete toxins to kill the invaders.
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