As you get ready to vote, reflect on this: According to new research, liberals may owe their political outlook partly to their genetic make-up, because political ideology is affected not just by social factors, but also by a dopamine receptor gene called DRD4.

When researchers asked 2,000 subjects about their politics, then took blood samples from them, they found that people with a specific variant of the DRD4 gene are more likely to be liberal as adults, but ONLY if they had an active social life as teenagers.

For more information, click here.