'Mad Dog' surfer Marcio Freire died while practicing in Nazare, Portugal
                                
                                
                                    (Newser) -
                                    Surfing legend Marcio Freire died Thursday in a place some call surfers' heaven: Nazare, Portugal, which is famous for its giant waves. The 47-year-old Brazilian died while practicing tow-in surfing, the local maritime authority said, per  Reuters . He was one of three surfers in the documentary  Mad Dogs , which looked...