This week, how computer design helps surgeons reconstruct breasts, why mammalian cells modified to contain a single set of chromosomes can help us understand the roll of individual genes, and the Bling from Outer Space - why our Earthly gold has less terrestrial origins. Plus, infra-red camoflague that can hide a tank, and Australopithecus sediba - why an incredible fossil find may be the missing link in human ancestry.