American biologists have accidentally discovered that two wounded crests (jelly-like marine animals) can grow into one large. Having seen an unusual double, they experimented with several more by cutting their bodies. It was found that they actually fuse together in just a couple of hours - even the nervous systems and digestive tracts are joined, although the mouths and other organs remain separate. According to scientists, nothing like this has been observed in any other species yet, and further research may lead to important discoveries in the field of regeneration.