Why a Sausage Works on Your Touch Screen
Animated Short, 0:44. Published 2026-11-10.
How do phone touch screens work, and why does a sausage work on one?
How touch screens work: your finger pulls a tiny electric field away from a grid of invisible wires under the glass. One winter in South Korea, people tapped their phones with snack sausages because their gloves didn't work.
Under the glass, rows of indium tin oxide wires send tiny pulses and columns listen. Every crossing holds an electric field. You're mostly salty water, so your finger pulls some of that field away, the crossing goes quiet, and the chip finds the middle of your touch. Wool doesn't conduct, so gloves fail. A sausage is salty and wet, so it works.
Transcript
Your touch screen works with a sausage. One freezing winter in South Korea, people really used them. But their warm gloves didn't work at all. So why would meat work, when a warm glove can't? Under the glass is a grid of wires too thin to see. Every crossing holds a tiny electric field. You're mostly salty water, so your finger pulls that field away, and the chip finds the middle of your touch.
Wool doesn't conduct. The glove pulls nothing, so the screen thinks nobody's there. But a sausage is salty and wet. Just like you. So that winter, the best phone stylus in Seoul was in the snack aisle. And the only one you could eat when the battery died.
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