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New Data Chip Activates a Secret Message When You Breathe On It

GIZMODO·1h ago·3 min read
Photograph via Gizmodo
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This stamp-sized optical device could be applied to credit cards or environmental sensors, researchers say.

This stamp-sized optical device could be applied to credit cards or environmental sensors, researchers say.

This stamp-sized optical device could be applied to credit cards or environmental sensors, researchers say.

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