To me, bioluminescence, the ability of some microbes, plants and animals to emit visible light, is one of the most interesting phenomena in the natural world. It's time to explore how some life forms have developed this talent, which evolved first in the blackness of the deep sea, and then among land plants and animals that glow against the backdrop of the night.
Most people are familiar with the fireflies that grace summer evenings. But the greenish glow doesn't end there. The image above shows eerie fungi found in a state park in Brazil - as if the woods in the nighttime weren't mysterious enough.
To get started, here's a video that showcases some deep sea bioluminescent creatures, as well as some octopi camoflaging themselves in amazing ways. There's more to come as we survey the luminous life around us.
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