Surfing is natural selection. A surfer selects a wave, the wave challenges the surfer and the better one surfs the further he (or she, misogynist) progresses. Some give up with their first Wavestorm hold down at Newport, some dominate until they’re slipping toothpicks into drainers at Pipe. But when it comes to Bloodlines -- a series where Billabong takes its best groms to the best waves on earth in effort to groom its young talent into mastery -- natural selection subsides and genetic modification comes into play. It’s science, and here it is proving theories in Sumbawa. Witness the Teen Age...no redheaded stepchildren here.