"(...) During this conversation, some of us had begun to tidy the rest of the hut-our holidays were coming to an end within a few days. Niels had started shaving. He had been living like a Norwegian lumberman, stuck away in some remote forest, and was astonished to see from the mirror how the razor was changing him back into a professor of physics within a matter of minutes.
"I wonder if a cat, also, would look more intelligent after a shave," he now mused.(...)"

In:
Werner Heisenberg
Physics and Beyond - Encounters and Conversations
Translated from the German by Arnold J. Pomerans
Harper & Row, Publishers Inc.
Library of Congress Catalog Number: 78-95963