Mythical Monster Hydra in the Petri Dish

In a story from Greek mythology, Hercules defeats the many-headed Hydra living in water. The story appears magical – monsters with several heads do not exist. Scientists from the Animal Ecology and Cell Biology Institute of the University of Veterinary Medicine Hannover were able to prove the that this is not the case; they discovered many-headed jellyfish, which develop when certain developmental genes are deactivated.