We have glands that put out oils and sweat on our skin. The skin on our fingers, palms of our hands, and feet have distinctive ridge patterns that are unique to each person. When we touch things — and we do touch lots of things — some of the oil and sweat is transferred from our hands and fingers to leave a fingerprint on that thing.
We have glands that put out oils and sweat on our skin. The skin on our fingers, palms of our hands, and feet have distinctive ridge patterns that are unique to each person. When we touch things — and we do touch lots of things — some of the oil and sweat is transferred from our hands and fingers to leave a fingerprint on that thing.
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