Open brain surgery is about as dangerous as it sounds, but for sufferers of conditions like Parkinson’s and epilepsy it can be the only way to relieve their symptoms. Unfortunately, this means drilling a hole in the skull and stimulating the brain with electrical currents, bringing on the risk of serious side effects. Fortunately, scientists have opened a new doorway to the brain, developing the Stentrode, a promising first-of-a-kind device that can deliver the currents to targeted areas through a small keyhole incision in the neck.