“In the early 1950s, […] there were two important advances in the interpretation of quantum mechanics, both made by the American physicist David Bohm. Just as there were, it seems, two Bohrs, there were apparently two Bohms: a 1951 Bohm and a 1952 Bohm.”

Jeremy Bernstein, Quantum Profiles (1991), John Stewart Bell: Quantum Engineer

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David Bohm42

American theoretical physicist 1917–1992

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“What we are left with, if what I have said so far is right, is a conclusion that I initially found very distressing: either GRW or some successor, or else Bohm or some successor, is the correct interpretation—or, to include a third possibility to please Itamar Pitowski, we will just fail to find a scientific realist interpretation which is acceptable.”

Hilary Putnam (1926–2016) American philosopher

And the ghost of Bohr will laugh, and say, ‘I told you all along that the human mind cannot produce a realist interpretation of quantum mechanics’!
"A philosopher looks at quantum mechanics (again)", Brit. J. Phil. Sci. 56 (2005), 615–634

“In a theory in which parameters are added to quantum mechanics to determine the results of individual measurements, without changing the statistical predictions, there must be a mechanism whereby the setting of one measuring device can influence the reading of another instrument, however remote. Moreover, the signal involved must propagate instantaneously, so that such a theory could not be Lorentz invariant. Of course, the situation is different if the quantum mechanical predictions are of limited validity. Conceivably they might apply only to experiments in which the settings of the instruments are made sufficiently in advance to allow them to reach some mutual rapport by exchange of signals with velocity less than or equal to that of light. In that connection, experiments of the type proposed by Bohm and Aharonov, in which the settings are changed during the flight of the particles, are crucial.”

John S. Bell (1928–1990) Northern Irish physicist

On the Einstein-Podolsky-Rosen paradox (1964)

“I came away from the two science surveys superficially acquainted with what was already a rather old-fashioned version of contemporary natural science. Relativity and quantum mechanics were mentioned… but not explained; the stars were still eternal; and both subatomic particles and biochemistry were discreetly omitted. …The two courses persuaded me that, in some sense, I understood the natural world. The illusion endured, for later in life… I tagged along by reading popular accounts, believing that the natural world out there was somehow within my reach, even without the mathematics that made quantum mechanics so mysteriously plausible.”

William H. McNeill (1917–2016) Canadian historian

The Pursuit of Truth: A Historian's Memoir (2005)

“Fred also previously received two honorary doctorates ….. They were both given by the relevant engineering faculties, but Fred always told people that they were for "back street mechanicing."”

Fred Dibnah (1938–2004) English steeplejack and television personality, with a keen interest in mechanical engineering

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“My own conclusion is that today there is no interpretation of quantum mechanics that does not have serious flaws. This view is not universally shared. Indeed, many physicists are satisfied with their own interpretation of quantum mechanics. But different physicists are satisfied with different interpretations. In my view, we ought to take seriously the possibility of finding some more satisfactory other theory, to which quantum mechanics is only a good approximation.”

Steven Weinberg (1933) American theoretical physicist

Source: Lectures on Quantum Mechanics (2012, 2nd ed. 2015), Ch. 3: General Principles of Quantum Mechanics

“Ever since quantum phenomena became definitely recognized many attempts were made to picture their mechanism.”

Boris Podolsky (1896–1966) American physicist

in his early Quantum Mechanics paper On King's Classical Theory of Radiation, Proceedings of the National Academy of Sciences, March 1, 1927, vol. 13, no.3, p. 97-100.

“Many of the founders of quantum mechanics, including Einstein, Erwin Schrödinger, and Louis de Broglie… were realists. For them quantum theory… was not a complete theory, because it did not provide a picture of reality absent our interaction with it. On the other side were Niels Bohr, Werner Heisenberg, and many others. Rather than being appalled, they embraced this new way of doing science.”

Lee Smolin (1955) American cosmologist

The Trouble With Physics: The Rise of String Theory, The Fall of a Science, and What Comes Next (2007)

“The two most important days in your life are the day you were born and the day you find out why.”

Mark Twain (1835–1910) American author and humorist

This appears on the opening placard of the film The Equalizer, attributing it to Twain, but there is no evidence that Twain wrote it. A precursor is found in Taylor Hartman's self-help book The Character Code (first published 1991), where it is not attributed to Twain: "The three most significant days in your life are: 1. The day you were born. 2. The day you find out why you were born. 3. The day you discover how to contribute the gift you were born to give" ( Google Books link https://books.google.com/books?id=gIKCxWxNmeMC&pg=PA147&dq=%22day+you+find+out+why%22&hl=en&sa=X&ved=0ahUKEwijrJzc84vLAhUJzGMKHajvADEQ6AEIIjAB#v=onepage&q=%22day%20you%20find%20out%20why%22&f=false) <br class="br">Disputed

“[The Many-worlds interpretation is the] only completely coherent approach to explaining both the contents of quantum mechanics and the appearance of the world.”

Hugh Everett (1930–1982) American physicist, author of the many-worlds interpretation of quantum mechanics

http://space.mit.edu/home/tegmark/everett/.

“The most efficient and practical interpretation of quantum mechanics is… no interpretation at all.”

F. J. Duarte (1954) Chilean-American physicist

in [Quantum Optics for Engineers, CRC, New York, 2013, 978-1439888537, F. J. Duarte]

“In the early 1950s, […] there were two important advances in the interpretation of quantum mechanics, both made by the American physicist David Bohm. Just as there were, it seems, two Bohrs, there were apparently two Bohms: a 1951 Bohm and a 1952 Bohm.”

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