Researchers have built a piece of a rat brain over the past 10 years and this week they're ready to show it off. Partially. What you're seeing here is a photo of a virtual brain slice, part of the Blue Brain Project as hosted at the Ecole Polytechnique Federale de Lausanne (EPFL). This chunk has been created digitally, mapping a section of juvenile rat brain for starters. Eventually the group hopes to show the whole brain - then move on to other animals.