The Origin of Ideology 

Are left and right a feature (or bug) of evolution?

By Chris Mooney

If you want one experiment that perfectly captures what science is learning about the deep-seated differences between liberals and conservatives, you need go no further than BeanFest. It’s a simple learning video game in which the player is presented with a variety of cartoon beans in different shapes and sizes, with different numbers of dots on them. When each new type of bean is presented, the player must choose whether or not to accept it—without knowing, in advance, what will happen. You see, some beans give you points, while others take them away. But you can’t know until you try them.