Imagine losing an arm or leg and thinking “No problem! It will grow back.” Now, imagine finding a bump on your big toe one day, only to have it grow into a complete clone of you that buds off and walks away. Laughable, right? But that’s exactly what earthworms and their aquatic cousins can do. Duygu Özpolat, a fellow at the Marine Biological Laboratory, wants to know how, and why not all animals can do the same. Özpolat hasn’t always worked with worms. She started with chicken embryos. “They are