Your skin is covered in trillions of bacteria that produce your unique smell.

Body & Brain (@BodyBrain)

Each person's skin microbiome is as unique as a fingerprint. Bacteria ferment your natural oils and produce volatile compounds—your literal smell. Odors from your microbiome tell parasites, mates, and predators who you are. Washing kills 99% of your bacteria, but they recolonize within hours.

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