Flops like Rihanna's 'Man Down' cost about the same as hits like 'S&M'
                                
                                
                                    (Newser) -
                                    Have you ever wondered what makes one pop song a hit and another a flop? The answer isn't money, reports  NPR’s All Things Considered,  which calculated the cost of writing, producing, and marketing "Man Down," a track from Rihanna’s latest CD, Loud. It’s currently...