There is nothing so beautiful (and sometimes breathtaking) than observing creatures designed with the ability to undergo fluorescence, the biological emission of light (also called bioluminescence).¹ Five scientists defined bioluminescence as “the chemical reaction between a substrate (luciferin) and an enzyme (luciferase) resulting in light emission in a living organism.”² What was the origin of such an amazing biochemical process? A recent Smithsonian news...