When Darwin hit his wall, he became despondent and depressed; his life ended in sadness. Like most people, he never looked for or found his second curve, so all he saw late in life was his decline. Meanwhile, when Bach saw the back half of his fluid intelligence curve, he jumped with both feet onto his crystallized intelligence curve and never looked back. When he fell behind as an innovator, he reinvented himself as an instructor. He died beloved, fulfilled, respected—if not as famous as he once had been—and, by all accounts, happy.
