"Evolution is a good place to look for why we're afraid of novel threats. Back then it made a lot of sense," he says. "It makes less and less sense as we are able to build up our cultural knowledge base." He asks: How do people in Chicago get electricity from nuclear reactors, but not fear them? If you substituted the number of deaths associated with electricity, I think a people would freak out,. But they wouldn't have any conception or the fact that even though they know how dangerous electricity is... We've somehow managed to get thinking so that they're not worried about it.