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Volatile organic compounds (VOCs) are released by heat, hitting your olfactory receptors before you even take a sip.

The screen is covered with a transparent conductive layer (usually Indium Tin Oxide).

This reacts to form a gas called syn-propanethial-S-oxide . When this gas hits the water layer on your eyeballs, it turns into a mild sulfuric acid. Your brain then triggers "reflex tears" to flush the irritant away. 4. The Engineering of a Touchscreen

When you slice an onion, you break its cells, releasing an enzyme called .

Friction between your shoe and the floor prevents your foot from sliding. On ice, the friction coefficient drops drastically, which is why your "equal and opposite reaction" results in a fall rather than a step.