What, you may well ask while staring vacantly at this computer screen, has been the secret of our success as a species? The stock reply to this burning question has traditionally been Intelligence. Upon receipt of such an answer, many people think that Intelligence is the ability to recall who won the Battle of the Bulge or how far it is from Guayaquil to Ulan Bator. Apart from the extremely improbable event of hooking up with some airhead at a party who is so impressed by factoids that she is willing to bear your child, these abilities are not likely to increase the chances of your genes surviving in another incarnation. They are merely the flickering lights on the Xmas tree of intelligence, not the presents beneath.