A new study published in the Proceedings of the National Academies of Science today reveals what we already suspected: Being "hotheaded" is an actual physiological phenomenon. So are butterflies in the stomach and...contemptuous loins?

All those pop-up stores opening up in unexpected locations around town aren't designed to amuse you. They're part of a devious plot to trigger certain chemicals in your brain so that you'll open your wallet and mindlessly hand over every penny you have in your wallet to the person standing behind the register. Really.