Meet hydra, the shape-shifting Dr Manhattan of the animal kingdom

In the comic series Watchmen, physicist Jon Osterman is blown apart in a science experiment gone awry. But his "consciousness" is able to pull his body back together atom by atom, becoming the radiating, blue-skinned Dr Manhattan. It took him months to reform, and in that time I wonder if he learned that trick from a tiny pond animal. For few creatures in fiction, and even fewer in real life, are capable of surviving being ripped to bits. But for hydras, it is an every day affair.

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