DARPA, known half-jokingly as the Department of Mad Scientists, has again turned its attention to the human brain, this time hoping to expand our insight into it and its structure through the use of incredibly tiny (read: atom-sized) graphene sensors. It detailed its latest effort on Monday, explaining its work in conjunction with the University of Wisconsin at Madison to create a new form of technology for peering into how the brain functions. This is done as part of President Obama?s brain initiative, says the research agency.