“As a consequence of disease and environmental forces, as well as other factors, a large number of polymorphisms may exist in a population. Some may be related to present selective forces, and others to forces which operated in the past, but which are no longer significant. Present gene frequencies may also result from gene mixture between populations.”

— Baruch Samuel Blumberg

[Polymorphisms of the serum proteins and the development of iso-preciptins in transfused patients, Bulletin of the New York Academy of Medicine, 40, 5, 1964, 377–386, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1750599/?page=2] (quote from 378)

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Baruch Samuel Blumberg 1

American doctor 1925–2011

Fritz Heider (1896–1988) German psychologist

Source: The psychology of interpersonal relations, 1958, p. 82

“If, however, one factor is too successful, it will continue to be the winning factor regardless of the variation in the other factors over the range of variation in the conditions, and therefore will stifle the development of other advantageous factors until the conditions change sufficiently that it no longer is the winning factor. At this point, the whole population is ill prepared for the change, and may well perish entirely if the winning factor accidentally becomes the matching factor for a disease or a predator.”

Erik Naggum (1965–2009) Norwegian computer programmer

Re: O'reilly subjugated to the Lisp juggenaut http://groups.google.com/group/comp.lang.lisp/msg/a10d0e7d8e7354b2 (Usenet article).
Usenet articles, Miscellaneous

“Rational mechanics must be the science of the motions which result from any forces, and of the forces which are required for any motions, accurately propounded and demonstrated. For many things induce me to suspect, that all natural phenomena may depend upon some forces by which the particles of bodies are either drawn towards each other, and cohere, or repel and recede from each other: and these forces being hitherto unknown, philosophers have pursued their researches in vain. And I hope that the principles expounded in this work will afford some light, either to this mode of philosophizing, or to some mode which is more true.”

Isaac Newton book Philosophiae Naturalis Principia Mathematica

Preface, translation in William Whewell's History of the Inductive Sciences http://books.google.com/books?id=vlQEAAAAQAAJ (1837)
Philosophiae Naturalis Principia Mathematica (1687)

“We guard against the forces of anti-Christian aggression, which may attack us from without, and the forces of ignorance and fear which may corrupt us from within.”

Franklin D. Roosevelt (1882–1945) 32nd President of the United States

Speech at Madison Square Garden, October 28, 1940
1940s

“The individual is a single, unique, independent, isolated, whole thing, embodying innumerable forces and materials past and present which are physical, biological, and social factors.”

Chester Barnard book The Functions of the Executive

Source: The Functions of the Executive (1938), p. 12

“An uneducated population may be degraded; a population educated, but not in righteousness, will be ungovernable. The one may be slaves, the other must be tyrants.”

Henry Melvill (1798–1871) British academic

Quote reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 364.
Dictionary of Burning Words of Brilliant Writers (1895)