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Phototube

technology Maturity 11-13

Some tubes can see light.

phototubes.jpg
phototubes.jpg
They catch light to work. Light hits the tube. Then it makes a tiny spark. This helps machines see. It is very cool! Can you see the light?

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File:phototubes.jpg
phototubes.jpg
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📚 Content adapted from Wikipedia | Readability: FK 14.6 | Vital Level 5