Which American automaker trades on the New York Stock Exchange under a one-letter stock symbol?

In popular "left brain, right brain" belief, musical and artistic creativity are governed by which part of the brain? Which spiny insectivore has a synonym for "pig" in its name, reportedly for its grunting as it forages in hedges? Which instrument, often attached to an inflatable cuff, is used to measure blood pressure? Which Irish poet of "The Winding Stair" shared his middle name with his painter brother Jack and their father, John? Which island, about 12 miles off the coast of Turkey, was the site of one of the Seven Wonders of the Ancient World? Which Italian writer's major works, including "The Prince," were partly a vain attempt to win back the favor of the Med… Which actress danced with Fred Astaire in "Shall We Dance" and "Swing Time"? Which king of England was a leader of the Third Crusade?