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Who said: “A change in motion is proportional to the motive force impressed and takes place along the straight line in which that force is impressed.”
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Without Quotes (13 quotes)

Ohne Phosphor, Kein Gedanke.
Without phosphorus there would be no thought.
From Lehre der Nahrungsmittel (1850), 115. (The title translates as Science of Food.) Some sources—incorrectly—attribute these words to Ludwig Büchner, who quoted it but credited it as Jakob “Moleschott’s well-known phrase” in Büchner’s Kraft und Stoff (1856), lxxv; later translated by the author from the 15th German edition in Force and Matter: Or, Principles of the Natural Order of the Universe (1891), 217.
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A catalyst is a substance which alters the velocity of a chemical reaction without appearing in the final products.
'Über Katalyse', Zeitschrift für Physikalische Chemie (1901), 7, 995-1004 as quoted in J. R. Partington, A History of Chemistry, Vol. 4 (1901), 599-600.
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Authority. Man cannot exist without it, and yet it brings in its train just as much of error as of truth. It perpetuates one by one things which should pass away one by one; it rejects that which should be preserved and allows it to pass away; and it is chiefly to blame for mankind’s want of progress.
In The Maxims and Reflections of Goethe (1906), 188.
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Nobody knows how the stand of our knowledge about the atom would be without him. Personally, [Niels] Bohr is one of the amiable colleagues I have met. He utters his opinions like one perpetually groping and never like one who believes himself to be in possession of the truth.
Quoted in Bill Becker, 'Pioneer of the Atom', New York Times Sunday Magazine (20 Oct 1957), 52.
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Our novice runs the risk of failure without additional traits: a strong inclination toward originality, a taste for research, and a desire to experience the incomparable gratification associated with the act of discovery itself.
From Reglas y Consejos sobre Investigacíon Cientifica: Los tónicos de la voluntad. (1897), as translated by Neely and Larry W. Swanson, in Advice for a Young Investigator (1999), 48.
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Science is the outcome of being prepared to live without certainty and therefore a mark of maturity. It embraces doubt and loose ends.
Quoted in interview by Tim Adams, 'This much I know: A.C. Grayling', The Observer (4 Jul 2009).
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The mystic and the physicist arrive at the same conclusion; one starting from the inner realm, the other from the outer world. The harmony between their views confirms the ancient Indian wisdom that Brahman, the ultimate reality without, is identical to Atman, the reality within.
In The Tao of Physics (1975), 305.
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The real value of science is in the getting, and those who have tasted the pleasure of discovery alone know what science is. A problem solved is dead. A world without problems to be solved would be devoid of science.
In Matter and Energy (1912), 18.
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When you can dump a load of bricks on a corner lot, and let me watch them arrange themselves into a house — when you can empty a handful of springs and wheels and screws on my desk, and let me see them gather themselves together into a watch — it will be easier for me to believe that all these thousands of worlds could have been created, balanced, and set to moving in their separate orbits, all without any directing intelligence at all.
In 'If A Man Die, Shall He Live again?', More Power To You: Fifty Editorials From Every Week (1917), 218-219.
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Without the suitable conditions life could not exist. But both life and its conditions set forth the operations of inscrutable Power. We know not its origin; we know not its end. And the presumption, if not the degradation, rests with those who place upon the throne of the universe a magnified image of themselves, and make its doings a mere colossal imitation of their own.
In Forms of Water in Clouds and Rivers, Ice and Glaciers (1872), 125.
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Without theory, practice is but routine born of habit. Theory alone can bring forth and develop the spirit of invention. ... [Do not] share the opinion of those narrow minds who disdain everything in science which has not an immediate application. ... A theoretical discovery has but the merit of its existence: it awakens hope, and that is all. But let it be cultivated, let it grow, and you will see what it will become.
Inaugural Address as newly appointed Professor and Dean (Sep 1854) at the opening of the new Faculté des Sciences at Lille (7 Dec 1854). In René Vallery-Radot, The Life of Pasteur, translated by Mrs. R. L. Devonshire (1919), 76.
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Worship the spirit of criticism. If reduced to itself it is not an awakener of ideas or a stimulant to great things, but, without it, everything is fallible; it always has the last word.
Address at the Inauguration of the Pasteur Institute. In René Vallery-Radot, The Life of Pasteur, translated by Mrs. R. L. Devonshire (1919), 443.
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You can only find truth with logic if you have already found truth without it.
In G.K. Chesterton, 'The Maxims of Maxim', Daily News (25 Feb 1905). Collected in G. K. Chesterton and Dale Ahlquist (ed.), In Defense of Sanity: The Best Essays of G.K. Chesterton (2011), 90.
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Carl Sagan Thumbnail In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
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Sophie Germain
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Ernest Rutherford
James Chadwick
Marcel Proust
William Harvey
Johann Goethe
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Carl Gauss
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- 90 -
Antoine Lavoisier
Lise Meitner
Charles Babbage
Ibn Khaldun
Euclid
Ralph Emerson
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- 80 -
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- 70 -
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Robert Fulton
Pierre Laplace
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Thomas Edison
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Carolus Linnaeus
- 60 -
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- 50 -
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- 40 -
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- 30 -
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Richard Feynman
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- 20 -
Carl Sagan
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- 10 -
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