![International Skeptics United show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/023/655/small/international-skeptics-united.jpg)
Summary: How balls of cells assemble into a baby, why cell shape is crucial in cancer, telling cells where to go in an embryo, and getting a handle on how limbs develop: this week's Naked Scientists explores the science of structure. Plus, does classical music make you brainier? News of what your Christmas dinner means to the microbes in your intestines and a breakthrough in tracking the international spread of pandemics...