In ancient Greek myth, the Hydra was a multi-headed monster that grew two more heads for every one that it lost. As it turns out, the real-life animal named after this mythical beast may be even more ...

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“It’s one of these organisms that’s thought to never die unless you try to kill it or, you know, starve it to death,” Ali Mortazavi, a developmental biologist at the University of California, Irvine, ...