Wired’s just published my latest article, Powered by Photons, in its November 2009 issue. This article is about the emerging technology of optogenetics, which allows neuroscientists to stimulate genetically altered neurons in the brain by cell type. It’s a much more precise technology than electricity, and it can be used both to detect and control neural activity. It opens up, for the first time, the possibility of two-way prosthetic devices where the brain both sends information to, and gets information from, the artificial body part. I visted Stanford and MIT to research this story, and it’s fascinating stuff.