Niels Bohr Quotes

An expert is a person who has made all the mistakes that can be made in a very narrow field.

The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.

Prediction is very difficult, especially about the future.

Everything we call real is made of things that cannot be regarded as real.

Those who are not shocked when they first come across quantum theory cannot possibly have understood it.

How wonderful that we have met with a paradox. Now we have some hope of making progress.

No, no, you're not thinking; you're just being logical.

There are some things so serious that you have to laugh at them.

Never express yourself more clearly than you are able to think

A physicist is just an atom's way of looking at itself.

Stop telling God what to do with his dice.

The meaning of life consists in the fact that it makes no sense to say that life has no meaning.

I remember discussions with Bohr which went through many hours till very late at night and ended almost in despair; and when at the end of the discussion I went alone for a walk in the neighbouring park I repeated to myself again and again the question: Can nature possibly be so absurd as it seemed to us in these atomic experiments?

There are trivial truths and there are great truths. The opposite of a trivial truth is plainly false. The opposite of a great truth is also true.

Every great and deep difficulty bears in itself it’s own solution. It forces us to change our thinking in order to find it.

We are all agreed that your theory is crazy. The question which divides us is whether it is crazy enough to have a chance of being correct. My own feeling is that it is not crazy enough.

Every sentence I utter must be understood not as an affirmation, but as a question. [A caution he gives his students, to be wary of dogmatism.]

You can recognize a small truth because its opposite is a falsehood. The opposite of a great truth is another truth.

Physics is not about how the world is, it is about what we can say about the world

We must be clear that when it comes to atoms, language can be used only as in poetry. The poet, too, is not nearly so concerned with describing facts as with creating images and establishing mental connections. [About describing atomic models in the language of classical physics:]

Your theory is crazy, but it's not crazy enough to be true.

The very nature of the quantum theory ... forces us to regard the space-time coordination and the claim of causality, the union of which characterizes the classical theories, as complementary but exclusive features of the description, symbolizing the idealization of observation and description, respectively.

An expert is a man who has made all the mistakes which can be made in a very narrow field.

We are suspended in language.

Mental patterns do not originate out of inorganic nature. They originate out of society, which originates out of inorganic nature. And, as anthropologists know so well, what a mind thinks is as dominated by biological patterns as social patterns are dominated by biological patterns and as biological patterns are dominated by inorganic patterns. There is no direct scientific connection between mind and matter. As the atomic scientist, Niels Bohr, said, "We are suspended in language." Our intellectual description of nature is always culturally derived.

Everything we call real is made of things that cannot be regarded as real. If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet.

It is the hallmark of any deep truth that its negation is also a deep truth

It is not enough to be wrong, one must also be polite.

Looking at the waves scudding outwards and getting lost on the horizon, he could not help but recall the words of his mentor, the Danish physicist Niels Bohr, who had once told him that a part of eternity lies in reach of those capable of staring, unblinking, at the sea’s deranging expanses.

Prediction,” as Niels Bohr liked to say, “is very difficult, especially if it’s about the future.

The Stone Age didn't end because the World ran out of stones

The ultimate lesson is that science isn’t special – at least not anymore. Maybe back when Einstein talked to Niels Bohr, and there were only a few dozen important workers in every field. But there are now three million researchers in America. It’s no longer a calling, it’s a career. Science is as corruptible a human activity as any other. Its practitioners aren’t saints, they’re human beings, and they do what human beings do – lie, cheat, steal from one another, sue, hide data, fake data, overstate their own importance and denigrate opposing views unfairly. That’s human nature. It isn’t going to change

The opposite of a truth," Klaus quoted, "is a falsehood; but the opposite of a profound truth...may be another profound truth." [Niels Bohr]

[About the great synthesis of atomic physics in the 1920s] It was a heroic time. It was not the doing of any one man; it involved the collaboration of scores of scientists from many different lands. But from the first to last the deeply creative, subtle and critical spirit of Niels Bohr guided, restrained, deepened and finally transmuted the enterprise.

You must come to Copenhagen to work with us. We like people who can actually perform thought experiments!

Vivere est Cogitare

In our description of nature the purpose is not to disclose the real essence of the phenomena but only to track down, as far as possible, relations between the manifold aspects of our experience.

The best weapon of a dictatorship is secrecy, but the best weapon of a democracy should be the weapon of openness.

The legendary Danish physicist Niels Bohr distinguished two kinds of truths. An ordinary truth is a statement whose opposite is a falsehood. A profound truth is a statement whose opposite is also a profound truth.

And at that age, the only boys I didn’t think were gross were dead scientists – and it’s not like I wanted to kiss those guys. (No offense, Niels Bohr.)

Nobody knows how the stand of our knowledge about the atom would be without him. Personally, 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.

I myself find the division of the world into an objective and a subjective side much too arbitrary. The fact that religions through the ages have spoken in images, parables, and paradoxes means simply that there are no other ways of grasping the reality to which they refer. But that does not mean that it is not a genuine reality. And splitting this reality into an objective and a. subjective side won't get us very far.

The physicist Niels Bohr was fond of saying, “Prediction is very hard to do. Especially about the future

The difference between science and philosophy is that the scientist learns more and more about less and less until she knows everything about nothing, whereas a philosopher learns less and less about more and more until he knows nothing about everything. There is truth in this clever crack, but, as Niels Bohr impressed, while the opposite of a trivial truth is false, the opposite of a great truth is another great truth.

Truth is: I was always that kind of girl. Truth is: they don’t make dresses any whiter than mine. Truth is: I am not Demeter’s daughter. I am Heisenberg’s ripe tomato I am Niels Bohr’s piece on the side. In the winter I am a particle. In the summer I am a wave. And I didn’t get to be queen of hell by letting folks off easy.

Despite the earnest belief of most of his fans, Einstein did not win his Nobel Prize for the theory of relativity, special or general. He won for explaining a strange effect in quantum mechanics, the photoelectric effect. His solution provided the first real evidence that quantum mechanics wasn’t a crude stopgap for justifying anomalous experiments, but actually corresponds to reality. And the fact that Einstein came up with it is ironic for two reasons. One, as he got older and crustier, Einstein came to distrust quantum mechanics. Its statistical and deeply probabilistic nature sounded too much like gambling to him, and it prompted him to object that “God does not play dice with the universe.” He was wrong, and it’s too bad that most people have never heard the rejoinder by Niels Bohr: “Einstein! Stop telling God what to do.

The opposite of a correct statement is an incorrect statement. The opposite of a profound truth is another profound truth (Niels Bohr)." By this, he means that we require a larger reading of the human past, of our relations with each other, the universe and God, a retelling of our older tales to encompass many truths and to let us grow with change.

كف عن إخبار الرب عما يجب عليه ان يفعله

Perhaps I have found out a little about the structure of atoms.

Anyone who is not shocked by quantum theory has not understood it.

If you can fathom quantum mechanics without getting dizzy, you don't get it Et kvantebitte spring nærmere supercomputeren

الخبير هو شخص ارتكب كل الأخطاء الممكنة في مجال محدد للغاية.

The great physicist Niels Bohr said, “There are two types of truth. In the shallow type, the opposite of a true statement is false. In the deeper kind, the opposite of a true statement is equally true.

In quantum mechanics...an observation here and now changes in general the 'state' of the observed system....I consider the unpredictable change of the state by a single observation...to be an abandonment of the idea of the isolation of the observer from the course of physical events outside himself.

Chinese dialectical reasoning had an impact on the physicist Niels Bohr, who was highly knowledgeable about Eastern thought. He attributed his development of quantum theory in part to the metaphysics of the East. There had been a centuries-long debate in the West about whether light consists of particles or waves. Belief in one was assumed to contradict and render impossible belief in the other. Bohr’s solution was to say that light can be thought of in both ways. In quantum theory, light can be viewed either as a particle or as a wave. Just never both at the same time.

An expert is a person who has made all the mistakes that can be made in a very narrow field.” –Niels Bohr

Copenhagen interpretation Niels Bohr’s combination of instrumentalism, anthropocentrism and studied ambiguity, used to avoid understanding quantum theory as being about reality.

How wonderful that we have met with paradox. Now we have some hope of making progress. —NIELS BOHR

Niels Bohr wrote, ‘The opposite of a true statement is a false statement, but the opposite of a profound truth can be another profound truth.

There is no quantum world. There is only an abstract quantum physical description. It is wrong to think that the task of physics is to find out how nature is. Physics concerns what we can say about Nature.

عكس مقولة صحيحة هو مقولة خاطئة ، ولكن عكس حقيقة مثبتة يمكن ان يكون حقيقة مؤكدة

Un experto es una persona que ha cometido todos los errores que se pueden cometer en un determinado campo.

The very fact that knowledge is itself the basis for civilization points directly to openness as the way to overcome the present crisis.

It is wrong to think that the task of physics is to find out how Nature is. Physics concerns what we say about Nature.

Bohr's standpoint, that a space-time description is impossible, I reject a limine. Physics does not consist only of atomic research, science does not consist only of physics, and life does not consist only of science. The aim of atomic research is to fit our empirical knowledge concerning it into our other thinking. All of this other thinking, so far as it concerns the outer world, is active in space and time. If it cannot be fitted into space and time, then it fails in its whole aim and one does not know what purpose it really serves.

Il fatto che la terra fosse rotonda, e non piatta come loro credevano, non impedì ai Fenici di circumnavigare l'Africa. Anche se il loro modello atomico era sbagliato, è pur sempre a Enrico Fermi e Niels Bohr che si deve il successo nella costruzione della bomba atomica. Quello che conta è che la base operativa funzioni.

Einstein came to distrust quantum mechanics. Its statistical and deeply probabilistic nature sounded too much like gambling to him, and it prompted him to object that “God does not play dice with the universe.” He was wrong, and it’s too bad that most people have never heard the rejoinder by Niels Bohr: “Einstein! Stop telling God what to do.

And even if Einstein could not be defied, he might be evaded. Those who sponsored this view talked hopefully about shortcuts through higher dimensions, lines that were straighter than straight, and hyperspacial connectivity. They were fond of using an expressive phrase coined by a Princeton mathematician of the last century: “Wormholes in space.” Critics who suggested that these ideas were too fantastic to be taken seriously were reminded of Niels Bohr’s “Your theory is crazy—but not crazy enough to be true.” If

All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident. ” —Arthur Schopenhauer “We are all agreed that your theory is crazy. The question that divides us is whether it is crazy enough to have a chance of being correct.” —Niels Bohr, Nobel Laureate & Quantum Physics Pioneer

An expert is a person who has found out by his own painful experience all the mistakes that one can make in a very narrow field.

When [Niels] Bohr is about everything is somehow different. Even the dullest gets a fit of brilliancy.

Some subjects are so serious that one can only joke about them.

I feel personally responsible for the universe's inevitable heat death.

The opposite of a truth," Klaus quoted, "is a falsehood; but the opposite of a profound truth...may be another profound truth." It either is or is not August...if I assert it's August when it isn't--simply false; but if I say that life is pain, that is true, profoundly so; so, too, that life is joy; the more profound the statement, the more reversible the deep truths are sedimented in syntax, the terms can be reversed... [Niels Bohr]

the dark lady who inspired Shakespeare’s sonnets, the lady of Arosa may remain forever mysterious.” (Unfortunately, because Schrödinger had so many girlfriends and lovers in his life, as well as illegitimate children, it is impossible to determine precisely who served as the muse for this historic equation.) Over the next several months, in a remarkable series of papers, Schrödinger showed that the mysterious rules found by Niels Bohr for the hydrogen atom were simple consequences of his equation. For the first time, physicists had a detailed picture of the interior of the atom, by which one could, in principle, calculate the properties of more complex atoms, even molecules. Within months, the new quantum theory became a steamroller, obliterating many of the most puzzling questions about the atomic world, answering the greatest mysteries that had stumped scientists since the Greeks. The

Early in April 1933, the German government passed a law declaring that Jews (defined as anyone with a Jewish grandparent) could not hold an official position, including at the Academy or at the universities. Among those forced to flee were fourteen Nobel laureates and twenty-six of the sixty professors of theoretical physics in the country. Fittingly, such refugees from fascism who left Germany or the other countries it came to dominate—Einstein, Edward Teller, Victor Weisskopf, Hans Bethe, Lise Meitner, Niels Bohr, Enrico Fermi, Otto Stern, Eugene Wigner, Leó Szilárd, and others—helped to assure that the Allies rather than the Nazis first developed the atom bomb. Planck

Using the word much as it is used in atomic physics to characterize the relationship between experience obtained by different experimental arrangements and visualized only by mutually exclusive ideas, we may truly say that different human cultures are complimentary to each other ... each such culture represents a harmonious balance of traditional conventions by means of which latent potentialities of human life unfold themselves in a way which reveals to us new aspects of its unlimited richness and variety.

We walked up and down in the snow, I on skis and she on foot (she said and proved that she could get along just as fast that way), and gradually the idea took shape that this was no chipping or cracking of the nucleus but rather a process to be explained by Bohr's idea that the nucleus was like a liquid drop; such a drop might elongate and divide itself. {On his aunt and fellow science Lise Meitner}

When Oppenheimer took the floor and began speaking in his soft voice, everyone listened in absolute silence. Wilson recalled that Oppenheimer “dominated” the discussion. His main argument essentially drew on Niels Bohr’s vision of “openness.” The war, he argued, should not end without the world knowing about this primordial new weapon. The worst outcome would be if the gadget remained a military secret. If that happened, then the next war would almost certainly be fought with atomic weapons. They had to forge ahead, he explained, to the point where the gadget could be tested. He pointed out that the new United Nations was scheduled to hold its inaugural meeting in April 1945—and that it was important that the delegates begin their deliberations on the postwar world with the knowledge that mankind had invented these weapons of mass destruction. “I thought that was a very good argument,” said Wilson. For some time now, Bohr and Oppenheimer himself had talked about how the gadget was going to change the world. The scientists knew that the gadget was going to force a redefinition of the whole notion of national sovereignty. They had faith in Franklin Roosevelt and believed that he was setting up the United Nations precisely to address this conundrum. As Wilson put it, “There would be areas in which there would be no sovereignty, the sovereignty would exist in the United Nations. It was to be the end of war as we knew it, and this was a promise that was made. That is why I could continue on that project.” Oppenheimer had prevailed, to no one’s surprise, by articulating the argument that the war could not end without the world knowing the terrible secret of Los Alamos. It was a defining moment for everyone. The logic— Bohr’s logic—was particularly compelling to Oppenheimer’s fellow scientists. But so too was the charismatic man who stood before them. As Wilson recalled that moment, “My feeling about Oppenheimer was, at that time, that this was a man who is angelic, true and honest and he could do no wrong. . . . I believed in him.

After the discovery of spectral analysis no one trained in physics could doubt the problem of the atom would be solved when physicists had learned to understand the language of spectra. So manifold was the enormous amount of material that has been accumulated in sixty years of spectroscopic research that it seemed at first beyond the possibility of disentanglement. An almost greater enlightenment has resulted from the seven years of Röntgen spectroscopy, inasmuch as it has attacked the problem of the atom at its very root, and illuminates the interior. What we are nowadays hearing of the language of spectra is a true 'music of the spheres' in order and harmony that becomes ever more perfect in spite of the manifold variety. The theory of spectral lines will bear the name of Bohr for all time. But yet another name will be permanently associated with it, that of Planck. All integral laws of spectral lines and of atomic theory spring originally from the quantum theory. It is the mysterious organon on which Nature plays her music of the spectra, and according to the rhythm of which she regulates the structure of the atoms and nuclei.