Wade-Dahl-Till valve was partially built by the novelist of what nationality?
Wade-Dahl-Till valve The Wade-Dahl-Till (WDT) valve is a cerebral shunt developed in 1962 by hydraulic engineer Stanley Wade, author Roald Dahl, and neurosurgeon Kenneth Till.
Grace Livingston Hill Grace Livingston Hill (April 16, 1865 – 1947) was an early 20th-century novelist and wrote both under her real name and the pseudonym Marcia Macdonald. She wrote over 100 novels and numerous short stories. Her characters were most often young female Christian women or those who become so within the confines of the story.