"“You’re not too heavily laden, Professor. What are those documents?” “Star charts,” he said firmly. “The true treasure of our civilization. A few books too—oh, what a horror it was that we were not able to empty the libraries! For once a book is lost to the ice, a little more of our past is gone forever. But as to my personal effects, my pots and pans, I have my own troop of slave bearers to help me with all that. They are called graduate students.”"