Everyone confesses in the abstract that exertion which brings out all the powers of body and mind is the best thing for us all; but practically most people do all they can to get rid of it, and as a general rule nobody does much more than circumstances drive them to do.
Bio: Charles Elachi is a Lebanese professor of electrical engineering and planetary science at the California Institute of Technology. From 2001 to 2016 he was director of the Jet Propulsion Laboratory and vice president of Caltech.
