The truth, according to the popular television show "Lie to Me," is "written all over our faces," but psychologists say that visual clues are only one part of the way humans read each other's emotions.
Can a facial expression catch you in a lie? New research shows mind-reading is a complex process. Presidents Obama, Bush and Clinton show pursed lips during tough press conferences, but what are they thinking?(AP Photo/Getty Images)
Just this week, police released the 911 tape and radio dispatches of the arrest of Harvard professor Henry Louis Gates Jr., trying to unravel whether -- in Obama's words -- the police department reacted "stupidly."
Read More: Obama 'Leaks' Emotion Over Gates-Cop Affair