Perhaps light is some sort of electric wave, whose nature we do not yet understand. He gave in his resignation, which was the best thing he could do in the circumstance. Cambridge University has nurtured great scientists, thinkers and poets such as Newton, Bacon, Byron, Milton and Darwin, who made outstanding contribution to the progress of mankind. The food supply will not increase nearly enough to match this, which means that we are heading into a crisis in the matter of producing and marketing food. (91 年考题 )