Article: It's chemical combustion when fireflies get that glow.(Knight Ridder Newspapers)

TALLAHASSEE, Fla. _ Why do fireflies glow?

It's magic. More accurately, it's chemical-reaction magic. Here's a simplified rundown on what happens:

Inside the firefly's belly are some special cells that contain two chemicals: luciferin and luciferase, reportedly named for the fallen angel of light, Lucifer.

When the firefly pushes oxygen into these special cells, the oxygen and chemicals combine with two other chemicals: magnesium and adenosine triphosphate, or ATP. (Human bodies turn most of what we eat into ATP, a compound that all living plants and animals use as energy in their cells.)

OK _ you still with me?

Now, when the ...

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