
In a live interview with Walter Cronkite of CBS News, on the day of the first moonwalk (20 July 1969)
Robert A. Heinlein: In Dialogue With His Century, Volume I (1907–1949): Learning Curve (2010)
"Colonies in space may be only hope, says Hawking" by Roger Highfield in Daily Telegraph (16 October 2001).
In a live interview with Walter Cronkite of CBS News, on the day of the first moonwalk (20 July 1969)
Robert A. Heinlein: In Dialogue With His Century, Volume I (1907–1949): Learning Curve (2010)
First State of the Union Address (30 January 1961)
1961, State of the Union
“This year I'm a star, but what will I be next year? A black hole?”
Richter is questioning here the 'picture of reality'
Source: after 2000, Doubt and belief in painting' (2003), p. 87, note 13
The Value of Science (1955)
Context: We are at the very beginning of time for the human race. It is not unreasonable that we grapple with problems. But there are tens of thousands of years in the future. Our responsibility is to do what we can, learn what we can, improve the solutions, and pass them on.
... It is our responsibility to leave the people of the future a free hand. In the impetuous youth of humanity, we can make grave errors that can stunt our growth for a long time. This we will do if we say we have the answers now, so young and ignorant as we are. If we suppress all discussion, all criticism, proclaiming "This is the answer, my friends; man is saved!" we will doom humanity for a long time to the chains of authority, confined to the limits of our present imagination. It has been done so many times before.
... It is our responsibility as scientists, knowing the great progress which comes from a satisfactory philosophy of ignorance, the great progress which is the fruit of freedom of thought, to proclaim the value of this freedom; to teach how doubt is not to be feared but welcomed and discussed; and to demand this freedom as our duty to all coming generations.
Vol. I, Ch. 1, Section 2, pg. 49.
(Buch I) (1867)
Radio WFAB Syracuse, , transcripted in "The Meaning of Radio Birth Control", April 1924, p. 111
Birth Control Review, 1918-32