Human senses

Cutting an onion triggers enzymes that make an airborne sulfur irritant, propanethial-S-oxide. It stings the eye's surface nerves, and the tears wash it away.

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No. The five-sense list is a simplification dating to Aristotle. Experts agree there are more, but they disagree on the exact number because the definition of a sense is not settled.

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Starter thread · AI-reviewed against its sources