The production and emission of light by a living organism.

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Why does my grass luminesce when I step on it?

I live in Austin Texas. My grass is in pretty bad shape but I have noticed small luminous spots on some areas after I step on them. I'm guessing this will be seasonal so, for the record, this is ...
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What is this blue-green bioluminescent invertebrate I saw at Aquarium of the Pacific?

I took this picture of an animal in the bioluminescent section of Aquarium of the Pacific in Long Beach, California, but I neglected to write down what it was. I've searched the Aquarium's web site, ...