- The Naked Scientists Podcast - Stripping Down Science, On Itunesu

This week, Chris Smith and Izzie Clarke are filling the gaps in their knowledge of teeth; we also meet the microbes in our mouths and test the battle of the toothbrushes. Plus, in the news, researchers grow new spinal discs in a dish, we explore the ghostly galaxy next door, and scientists discover one of the largest, oldest structures on the planet.