A child's handprint on a Petri dish after petting a dog. Wash your hands!
Of note; this experiment lacks control. A handprint from a hand that did not touch a dog is missing.
Edit: spelling
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From @phdumb
A child's handprint on a Petri dish after petting a dog. Wash your hands!
Of note; this experiment lacks control. A handprint from a hand that did not touch a dog is missing.
Edit: spelling