Jensen Huang is a man on a mission—but not so much that he does not have time to tell a good story at his own expense. Last spring, when his semiconductor company, Nvidia, was well on its way to becoming a darling of generative artificial intelligence (AI), he and his wife bought a new home in the Bay Area. Mr Huang was so busy he could not spare much time to visit it before the purchase was completed. Pity, he admitted later, sneezing…