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If you want to see how filthy hands are, check out you iPhone screen after one day. I think a great science fair project would be to swab the screen and grow it out in a Petrie dish.
Is it normal To Feel Contaminated After Shaking Hands With Anyone?
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If you want to see how filthy hands are, check out you iPhone screen after one day. I think a great science fair project would be to swab the screen and grow it out in a Petrie dish.