Not cool. Fluorescent green bunny rabbits were born in Istanbul last week after a team of University of Hawaii and Turkish researchers managed to produce the litter—a feat which could mean a new way to develop cheaper medicines. The bunnies were injected with a fluorescent protein from jellyfish DNA, which is what makes them glow under a black light. In normal lighting, you would never know the difference. "It's just a marker to show that we can take a gene that was not originally in the animal and now exists in the animal that expresses," Dr. Joel Marh said. Next stop: larger animals.