the.com/bioluminescence

life's answer to darkness: cold fire made of chemistry, not heat

means the production and emission of light by a living organism through a chemical reaction, as seen in fireflies, anglerfish, and glowing plankton.

from A modern scientific compound: Greek bios, "life," bolted onto Latin lumen, "light" (related to luminous and illuminate), plus the noun-forming -escence that suggests a process underway. So the word literally reads "living-light-becoming" — a 19th-century coinage from the age when naturalists were busy naming the strange glows they kept hauling up from the deep sea and finding in the night.

cold light
converts nearly all energy to light, almost no heat
deep sea
most ocean creatures below glow in some way
luciferin name
named after Lucifer, meaning light-bringer
fungal glow
some mushrooms shine green to lure spore-spreading insects
defensive vomit
some squid spew glowing clouds to blind predators
for instance

fireflies — photinus pyralis produce light through luciferin oxidation in abdomens across north america

dinoflagellates — noctiluca scintillans create glowing waves off coasts like puerto rico and new zealand

anglerfish — melanocetus johnsonii females use bioluminescent lures 2,000+ meters deep in oceans

glowworms — arachnocampa species in waitomo caves, new zealand create star-like ceiling displays

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