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Blue

SciShow Tangents

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The Origins of Worms

Worms glow blue under UV light when they're dying. Researchers found the source of the blue was actually a molecule called anthronelic acid, which is found in the worms guts. Another way to make a worm glow blue is to threaten a marine parchment tube worm so that it makes its patented glowing blue mucus for several days.

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