"It is our responsibility as scientists, knowing the great progress which comes from a satisfactory philosophy of ignorance, the great progress which is the fruit of freedom of thought, to proclaim the value of this freedom, to teach how doubt is not to be feared but welcomed and discussed; and to demand this freedom as our duty to all coming generations" ---- Richard Feynman, 1955 ---- First, as students from Cal Tech and MIT and then as researchers and teachers from other universities and industry, we are bene?ted greatly from the philo- phy of learning practiced by these and other...