... soju, a Korean spirit that Psy calls his 'best friend'
                                
                                
                                    (Newser) -
                                    Vodka and tequila, head to the back of the bar. The world's most popular liquor is a South Korean spirit called soju, which has topped a  best-selling-drink list  for years and sold 65 million cases on this year's list alone, the  Guardian  reports. It's made from barley,...