"Some years later I spoke to a mentally disturbed young man. Very agitatedly, he described to me how alien beings from…"

"I used to climb mountains in snow and ice, hanging onto the sides of great rocks. I was describing one of my adventur…"

"I often dream about falling. Such dreams are commonplace to the ambitious or those who climb mountains. Lately I drea…"

"Most physicists enjoy the outdoors. They are mushroom gatherers, bird watchers, hikers, amateur mountaineers whose id…"

"People did not always love the mountains. Just a few hundred years ago the high mountains were regarded as horrible, …"

"Mountain climbing is an analogue of the research process in theoretical physics. In working on a problem in physics o…"

"Although the idea that the universe has an order that is governed by natural laws that are not immediately apparent t…"

"We surely stand at the threshold of a great adventure of the human spirit — a new synthesis of knowledge, a potential…"

"It is very unlikely that we would drive to extinction any native Martian microorganisms in the process of extending t…"

"We do not need a lunar-orbiting station to go to the Moon. We do not need such a station to go to Mars. We do not nee…"