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eyes

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Person wiping tears from their eyes while cutting onions on a kitchen counter

Food & Chemistry

Why Do We Cry When Cutting Onions?

Cutting an onion releases a chemical gas that reacts with the moisture in your eyes to form a mild acid. Your eyes water to flush it out.

onionscrying
Close-up of a human eye mid-blink

Biology & Neuroscience

Why Do We Blink?

Blinking lubricates your eyes, clears debris, and may give your brain a brief processing reset. We do it 15 to 20 times per minute without noticing.

blinkingeyes