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It’s the second Tuesday of the month, which is when we check in with our commentators in the field. In this month’s episode of Field Notes , Susan Knight of Trout Lake Station suggests we take a walk in the dark to see fireflies and other glowing organisms. It is almost firefly season. I am sure I am not the only one who is transported back to kid-hood when I see the first fireflies of the summer. Fireflies are beetles who make conspicuous use of bioluminescence, the emission of light by living organisms. Fireflies are not the only bioluminescent creatures; many other animals, especially in the ocean, use bioluminescence to signal their presence in the dark. However, there are also bioluminescent mushrooms, and even bioluminescent bacteria. And there may even be bioluminescent trees in our future. Sometimes knowing how something works, especially something as magical as a firefly’s light, can take away some of the fun. However, knowing how bioluminescence works really just adds to the |