“The abandonment of traditional iron smelting in most parts of Africa is probably the most important instance of technological regression.”

Philosophical Essay on Probabilities (1902)
Context: The most important questions of life... are indeed for the most part only problems of probability. Strictly speaking it may even be said that nearly all our knowledge is problematical; and in the small number of things which we are able to know with certainty, even in the mathematical sciences themselves, the principal means for ascertaining truth—induction and analogy—are based on probabilities.<!--p.1

Source: Language, Truth, and Logic (1936), Ch. 1, first lines.
Context: The traditional disputes of philosophers are, for the most part, as unwarranted as they are unfruitful. The surest way to end them is to establish beyond question what should be the purpose and method of a philosophical enquiry. And this is by no means so difficult a task as the history of philosophy would lead one to suppose. For if there are any questions which science leaves it to philosophy to answer, a straightforward process of elimination must lead to their discovery.

ibid.

Carol Ness, "Beat Poet Gregory Corso, 70, Dies of Cancer" http://sfgate.com/cgi-bin/article.cgi?file=/chronicle/archive/2001/01/18/MN143830.DTL, San Francisco Chronicle, 2001-01-18. : On Gregory Corso.
2000s

On the teams created in the 1960s during the Space Race, in "Space Lifeguard : An Interview with Gene Kranz" at Space.com (11 April 2000) http://web.archive.org/web/20000818064509/http://www.space.com/peopleinterviews/apollo13_kranz_iview_000411.html
Context: We had risen to probably one of the greatest challenges in history, put a man on the moon in the decade. We'd created incredible technologies. But what was most important, we'd created the teams, what I call the human factor. People who were energized by a mission. And these teams were capable of moving right on and doing anything America asked them to do in space. And what we did is we watched these teams disappear. We watched the great contractors — the Grummans, the North Americans, the Lockheeds — disappear from the horizon. I think that's really sad that as Americans we have destroyed much of this infrastructure that we had in the days when we went to the moon.

in the scientific sense
The last statement in her notebook
Waiting on God (1950)

Micah Sparks, Chapter 9, p. 132
2000s, Three Weeks with My Brother (2004)

Source: An Introduction To Probability Theory And Its Applications (Third Edition), Chapter V, Conditional Probability, Stochastic Independence, p. 132.

Kenneth Boulding (1958, p. 95) as cited in: Edward Stamp, Michael J. Mumford, Ken V. Peasnell (1993) Philosophical Perspectives on Accounting. p. 147
1950s