Pyrosomes, colonial salps, continue to be one of the most mysterious of bioluminescent organisms. Their glow can last 15 seconds or more, and it can be triggered by light, even cascading from one end of the colony to the other. The chemical origin remains unknown. It was thought to be bacterial, in part because of similar kinetics, but now appears to be intrinsic chemistry that lets this animal emit its impressive glow.

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