Neurosurgeons Use Water to Map Connections in the BrainGeorge Dvorsky11/26/13 12:40pm114EditPromoteDismissUndismissHideGo to permalinkSee that walnut-like object in this brain scan? It's a tumor that needs to be removed. But to avoid damaging critical functions like speech and vision, surgeons have to see the brain's tangled web of connections. The solution? Just add water.