At first glance, Mike Levin’s lab looks like any standard biology lab with its shelves of petri dishes containing small, brown, semitransparent flatworms called planaria, one of the organisms his lab studies. Look more closely at the bodies of the tiny worms swimming and stretching under the plastic, however, and you might notice something strange—instead of a head and tail, each worm has two fully functional heads.
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Source: Phys.org