A newly published study coming out of the University College London in the UK suggests there may be clear differences in brain structure between liberals and conservatives. The part of the brain known as the amygdala – which is primarily responsible for reacting with fear and other more primitive emotions – was observed to be larger in people who identify with more conservative beliefs. At the same time – conservatives appeared to have a smaller portion of the brain known as the anterior cingulate – the part that is responsible for optimistic thinking. These results may explain why conservatives tend to put more of an emphasis on national security issues - and are more motivated by fear-driven arguments regarding terrorism. They also seem to align their beliefs with “worst case scenarios” – like Medicare is a train wreck! Social Security is bankrupt! It's why they freak out instead of wanting to work to these programs better. But the study does provide some insight into how to argue with a conservative – you just have to scare him!