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Movement requires a lot of energy. Simply absorbing nutrients through the surface of the body as Dickinsonia did was much too slow a process. Mobile Online Radio would need to consume huge quantities of food. And they would do that by evolving the very first stomachs, mouths and teeth. You can see how they might have done so in Switzerland Online Radio where a new kind of technology provides a window into the past. This stadiumsized building houses one of the world's most powerful microscopes. It's called the synchrotron. Professor Philip Donoghue is preparing the tiniest of fossils for the synchrotron. These miniscule balls were excavated from a quarry in South China. Each and every one of them is the fossilised embryo of an ancient creature. If we really want to understand these fossils, what we need to do is not just to look at the surface which we can do with an electron microscope. We need to look inside. We have to use some form of Xray tomography, a bit like CAT scanners in hospitals. But we have to use one that allows us to look at the very tiniest details down to a thousandth of a millimetre. The synchrotron is the only Xray type machine that provides the kinds of resolution that we need to see all the tiny details within the fossilised embryos. KLAXON SOUNDS It was astonishing, I mean it was a real eureka moment that you could get to the very finest levels of fossilisation, the very finest detail that the fossil record could ever give up using this technology. Powerful generators fire highenergy electrons around a circular tube at close to the speed of light. After one million orbits, the electrons emit Xrays so powerful, they can penetrate solid rock or these tiny fossils. Donoghue uses data from the synchrotron to build a threedimensional picture of the fossils. We know it's a fossil embryo because it's surrounded by a preserved egg sac. And using tomography we can see inside to the developing animal. This fossil is the embryo of a tiny marine worm called Markuelia. It lived just twenty million years after the Online Radio of Ediacara.