She and boyfriend Martin Kirsten drag trio to safety
                                
                                
                                    (Newser) -
                                    Heidi Klum is the latest celebrity-turned-superhero: On vacation in Oahu, her son Henry, 7, was swept away in a riptide; two nannies were also caught up in it. Klum and bodyguard-turned-boyfriend Martin Kirsten jumped in and made sure everyone got to shore,  Us  reports. "We were able to get...