To keep any art exhibit running long-term, there needs to be a steady flow of visitors. If too many people are touching and bumping into the sculptures, the wear and tear accumulate faster. Not enough, and the exhibit can’t muster the funding to stay open. The flow of visitors is analogous to blood circulation, flowing through the halls of the brain’s vasculature to deliver oxygen and nutrients. “About a third of the microglial population is actually situated on the vasculature,” University of Virginia professor Ukpong Eyo said. “If we eliminate these microglia, we can see that the vasculature...