The blank robotic stare perfected by many a wannabe poker star is a waste of one’s energies. A study conducted by researchers at Harvard, MIT and the California Institute of Technology has concluded that a ‘confident’ smile directed your opponent’s way causes them to fold their hands a disproportionate amount of the time. The effect works on the part of your brain that identifies a certain look as suggesting ‘trustworthiness’. Remember the smile on that used car salesman who sold you the Toyota with the dodgy accelerator pedal? Yeah, that’s the look you want. Read more.