Every January the cognoscenti know to look out for the annual question posed by literary agent and self-styled intellectual impresario John Brockman on his Edge "salon" website. The trick, of course, is to get the question just right so that the great and good - and the wannabes - feel compelled to play what is often the smartest game in town.
One of my favourites was the deceptively simple tease: "What do you believe is true even though you cannot prove it?" (2005), which provided diverse snapshots of individual intellectuals at work and of emerging trends.
With this year's question, though, Brockman gets really tricksy: "What scientific concept would improve everyone's cognitive toolkit?"