As the story goes, Sir Isaac Newton saw an apple fall from the Flower of Kent tree at Woolsthorpe Manor in Lincolnshire, England, inspiring him to discover the laws of gravity. Later it was said it hit him on the head.
The apple is green, pear shaped, mealy, sub acid and used for cooking. It ripens in late season. Perhaps a blow on the head from this apple will inspire you too.
USDA Zones 5-9.