Okay, in a nutshell: Fireflies glow thanks to a chemical reaction between luciferin, the enzyme luciferase, ATP, and oxygen ✨ The enzyme binds luciferin and ATP, then oxygen swoops in to oxidize it—releasing energy as visible light instead of heat! All happening inside specialized cells called photocytes in the firefly’s abdomen. There are a bunch of extra layers of complexity here (enzymes, intermediates, nitric oxide signaling, mitochondria playing oxygen traffic cop, etc.), but this is the gi

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