If you watch the news or read the opinion pages, you could be forgiven for thinking that liberals and conservatives are members of completely different species. But why is it that these different groups have such a hard time getting along? A team of scientists from Nebraska thinks that the answer has to do with people’s bodies – specifically, how they’re physiologically predisposed to respond to the good and bad in their environments. The difference between conservatives and liberals, then, may go all the way down to the brainstem. And this difference can affect religious orientation, too.