worm

Up until recently, habituation -- a simple form of learning -- was deemed the exclusive domain of complex organisms with brains and nervous systems, such as worms, insects, birds, and mammals.

In it, they explain the molecular mechanism of regeneration in marine worms and thus create a better understanding of the natural reprogramming ability of cells.

Paul De Ley, an associate professor of nematology at UCR, confirmed its fit as an early nematode and ruled out other worm types.

It's not known whether he took a dose of it when he purportedly had a parasitic worm in his brain "which ate a portion of it and then died."

His admission that he had suffered from a brain worm, and a separate story about his dumping of a dead bear in New York's Central Park, dominated headlines for days.