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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Can a firefly control its glow?

I've just seen this animation: I always thought the firefly glow is ongoing slow chemical reaction, like in glowsticks though through different chemicals. As such it seems impossible to control ...