This week, we have a final show from Perth in Western Australia. Chris Smith and Victoria Gill find out how camouflage wetsuits might help protect surfers from sharks, hear about a new development in muscular dystrophy treatment, how sea sponges can be used to mend fractures and whether the chemicals that a cell produces just before death can help us reverse the damage caused by stroke. In the news, why money makes the world go round, the comet that will be lighting up the skies in November, the eniromentally green military flares that could result in clearer firework displays and the scientists that have produced the world's most accurate clock.