“The only factor becoming scarce in a world of abudance is human attention.”
Out of Control: The New Biology of Machines, Social Systems and the Economic World (1995), New Rules for the New Economy: 10 Radical Strategies for a Connected World (1999)
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Kevin Kelly 141
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Source: Understanding International Conflicts: An Introduction to Theory and History (6th ed., 2006), Chapter 8, The Information Revolution and the Diffusion of Power, p. 252.

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L.M. Branscomb, J.C. Thomas (1984) "Ease of use: a system design challenge". in: IBM Systems Journal. Vol 23.3, Sept 1984. Pages 224-235

“[T]he laws of science are products of the human mind rather than factors of the external world.”
Introductory
The Grammar of Science (1900)

1960s, Family Planning - A Special and Urgent Concern (1966)
Context: The Negro constitutes half the poor of the nation. Like all poor, Negro and white, they have many unwanted children. This is a cruel evil they urgently need to control. There is scarcely anything more tragic in human life than a child who is not wanted. That which should be a blessing becomes a curse for parent and child. There is nothing inherent in the Negro mentality which creates this condition. Their poverty causes it. When Negroes have been able to ascend economically, statistics reveal they plan their families with even greater care than whites. Negroes of higher economic and educational status actually have fewer children than white families in the same circumstances.

1950s, The Russell-Einstein Manifesto (1955)
Context: Here, then, is the problem which we present to you, stark and dreadful and inescapable: Shall we put an end to the human race; or shall mankind renounce war? People will not face this alternative because it is so difficult to abolish war.
The abolition of war will demand distasteful limitations of national sovereignty. But what perhaps impedes understanding of the situation more than anything else is that the term "mankind" feels vague and abstract. People scarcely realize in imagination that the danger is to themselves and their children and their grandchildren, and not only to a dimly apprehended humanity. They can scarcely bring themselves to grasp that they, individually, and those whom they love are in imminent danger of perishing agonizingly. And so they hope that perhaps war may be allowed to continue provided modern weapons are prohibited.
This hope is illusory. Whatever agreements not to use H-bombs had been reached in time of peace, they would no longer be considered binding in time of war, and both sides would set to work to manufacture H-bombs as soon as war broke out, for, if one side manufactured the bombs and the other did not, the side that manufactured them would inevitably be victorious.
Source: Leisure, the Basis of Culture (1948), The Philosophical Act, pp. 64–65
Source: Leisure: The Basis Of Culture

1930s, On Protracted Warfare (1938)
Source: The Next Development in Man (1948), p. 203