By Heather Goldstone and Elsa Partan

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. Read more and hear broadcast …