On a more serious note, GFP has been used for several years as an important tracer in molecular biology experiments. It discoverers were awarded a Nobel prize in 2008. The original gene has been genetically modified to create a stronger signal, "enhanced" GFP, and it has even been modified to produce at least eight different fluorescent colors. I recommend the Wiki entry for GFP if you want more information on this interesting tool, that is not only very useful to molecular biologists, but ranks way-high on the kewl factor.
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