Regina G. Barber

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Regina Barber here.

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Parasites scare me.

I think of cordyceps, the parasitic fungus that inspired the video game-turned-TV series The Last of Us, the one that in real life bursts out of the head of ants and controls them when they're dead.

Or I think of people finding a tapeworm in their bodies after eating raw meat.

Those have haunted me since childhood.

And even more unsettling, I was reminded recently by a paleontologist that parasites have been around a lot longer than I had thought.

Carmen Nenglu's that paleontologist.

He's at the University of California, Riverside, and he says trying to trace how far back parasites popped up is hard work.

They're rare to find in fossils.

Among other things, they tend to be made of only soft tissue that doesn't preserve well in rock.