Frases de Richard Feynman

Richard Feynman photo
10   8

Richard Feynman

Data de nascimento: 11. Maio 1918
Data de falecimento: 15. Fevereiro 1988
Outros nomes: Richard Feynman Philips, Richard Phillips Feynman, Ричард Филлипс Фейнман

Richard Philips Feynman foi um físico norte-americano do século XX, um dos pioneiros da eletrodinâmica quântica, e Nobel de Física de 1965. É irmão mais velho da astrofísica Joan Feynman.

Obras

„Os poetas reclamam que a ciência retira a beleza das estrelas. Mas eu posso vê-las de noite no deserto, e senti-las. Vejo menos ou mais?“

—  Richard Feynman, livro The Feynman Lectures on Physics

Poets say science takes away from the beauty of the stars — mere globs of gas atoms. Nothing is "mere". I too can see the stars on a desert night, and feel them. But do I see less or more?
The Feynman Lectures on Physics: Mainly Mechanics, Radiation, and Heat‎, de Richard Phillips Feynman, Robert B. Leighton, Matthew L. Sands - Publicado por Addison-Wesley, 1963

„A filosofia da ciência é tão útil para o cientista quanto a ornitologia para os pássaros“

—  Richard Feynman

Richard Feynman, conforme relatado por Singh, Simon - Big Bang - Editora Record - Rio de Janeiro / São Paulo - 2006. ISBN: 85-01-07213-3 (pág. 459)

„Posso dizer seguramente que ninguém entende a física quântica.“

—  Richard Feynman, livro The Character of Physical Law

I think I can safely say that nobody understands quantum mechanics
The Character of Physical Law (1965) Ch. 6; MIT Press, 1967

„A Física está para a Matemática como o sexo está para a masturbação.“

—  Richard Feynman

Physics is to mathematics what sex is to masturbation
Richard Feynman citado em "Physically speaking: a dictionary of quotations on physics and astronomy"‎ - Página 215, Carl C. Gaither, Alma E. Cavazos-Gaither - CRC Press, 1997, ISBN 0750304707, 9780750304702 - 492 páginas

„Se você acha que entendeu alguma coisa sobre mecânica quântica, então é porque você não entendeu nada.“

—  Richard Feynman

If you think you understand quantum mechanics, you don't understand quantum mechanics.
citado em "Armageddon now: the end of the world A to Z‎" - Página 337, Jim Willis, Barbara Willis - Visible Ink Press, 2005, ISBN 0780809238, 9780780809239 - 450 páginas
Atribuídas

„A ideia é fornecer todas as informações, para que os outros possam julgar o valor de sua contribuição, e não apenas as informações que dirijam o julgamento para uma direção específica.“

—  Richard Feynman

Sobre escolhas seletivas na investigação científica.
como citado por Ben Goldacre em Ciência picareta; tradução de Renato Rezende, Rio de Janeiro: Civilização Brasileira, 2015, versão kindle, posição 1879.
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„It is really quite impossible to say anything with absolute precision, unless that thing is so abstracted from the real world as to not represent any real thing.“

—  Richard Feynman

" New Textbooks for the "New" Mathematics http://calteches.library.caltech.edu/2362/1/feynman.pdf", Engineering and Science volume 28, number 6 (March 1965) p. 9-15 at p. 14
Paraphrased as "Precise language is not the problem. Clear language is the problem."
Contexto: The real problem in speech is not precise language. The problem is clear language. The desire is to have the idea clearly communicated to the other person. It is only necessary to be precise when there is some doubt as to the meaning of a phrase, and then the precision should be put in the place where the doubt exists. It is really quite impossible to say anything with absolute precision, unless that thing is so abstracted from the real world as to not represent any real thing.Pure mathematics is just such an abstraction from the real world, and pure mathematics does have a special precise language for dealing with its own special and technical subjects. But this precise language is not precise in any sense if you deal with real objects of the world, and it is only pedantic and quite confusing to use it unless there are some special subtleties which have to be carefully distinguished.

„We are not to tell nature what she’s gotta be.“

—  Richard Feynman

Sir Douglas Robb Lectures, University of Auckland (1979); lecture 1, "Photons: Corpuscles of Light" http://www.youtube.com/watch?v=eLQ2atfqk2c&t=48m01s
Contexto: We are not to tell nature what she’s gotta be. … She's always got better imagination than we have.

„I learned very early the difference between knowing the name of something and knowing something.“

—  Richard Feynman, livro What Do You Care What Other People Think?

"The Making of a Scientist," p. 14 <!-- Feynman used variants of this bird story repeatedly: (1) "What is Science?", presented at the fifteenth annual meeting of the National Science Teachers Association, in New York City (1966) published in The Physics Teacher, volume 7, issue 6 (1969), p. 313-320. (2) Interview for the BBC TV Horizon program "The Pleasure of Finding Things Out" (1981), published in Christopher Sykes, No Ordinary Genius: The Illustrated Richard Feynman (1994), p. 27. -->
What Do You Care What Other People Think? (1988)
Contexto: You can know the name of that bird in all the languages of the world, but when you're finished, you'll know absolutely nothing whatever about the bird. You'll only know about humans in different places, and what they call the bird. … I learned very early the difference between knowing the name of something and knowing something.

„Our freedom to doubt was born out of a struggle against authority in the early days of science. It was a very deep and strong struggle: permit us to question — to doubt — to not be sure. I think that it is important that we do not forget this struggle and thus perhaps lose what we have gained.“

—  Richard Feynman

The Value of Science (1955)
Contexto: The scientist has a lot of experience with ignorance and doubt and uncertainty, and this experience is of very great importance, I think. When a scientist doesn’t know the answer to a problem, he is ignorant. When he has a hunch as to what the result is, he is uncertain. And when he is pretty darn sure of what the result is going to be, he is still in some doubt. We have found it of paramount importance that in order to progress we must recognize our ignorance and leave room for doubt. Scientific knowledge is a body of statements of varying degrees of certainty — some most unsure, some nearly sure, but none absolutely certain. Now, we scientists are used to this, and we take it for granted that it is perfectly consistent to be unsure, that it is possible to live and not know. But I don’t know whether everyone realizes this is true. Our freedom to doubt was born out of a struggle against authority in the early days of science. It was a very deep and strong struggle: permit us to question — to doubt — to not be sure. I think that it is important that we do not forget this struggle and thus perhaps lose what we have gained.

„The real problem in speech is not precise language. The problem is clear language.“

—  Richard Feynman

" New Textbooks for the "New" Mathematics http://calteches.library.caltech.edu/2362/1/feynman.pdf", Engineering and Science volume 28, number 6 (March 1965) p. 9-15 at p. 14
Paraphrased as "Precise language is not the problem. Clear language is the problem."
Contexto: The real problem in speech is not precise language. The problem is clear language. The desire is to have the idea clearly communicated to the other person. It is only necessary to be precise when there is some doubt as to the meaning of a phrase, and then the precision should be put in the place where the doubt exists. It is really quite impossible to say anything with absolute precision, unless that thing is so abstracted from the real world as to not represent any real thing.Pure mathematics is just such an abstraction from the real world, and pure mathematics does have a special precise language for dealing with its own special and technical subjects. But this precise language is not precise in any sense if you deal with real objects of the world, and it is only pedantic and quite confusing to use it unless there are some special subtleties which have to be carefully distinguished.

„We can deduce, often, from one part of physics like the law of gravitation, a principle which turns out to be much more valid than the derivation.“

—  Richard Feynman, livro The Character of Physical Law

Fonte: The Character of Physical Law (1965), chapter 2, “ The Relation of Mathematics to Physics http://www.youtube.com/watch?v=M9ZYEb0Vf8U” referring to the law of conservation of angular momentum
Contexto: Now we have a problem. We can deduce, often, from one part of physics like the law of gravitation, a principle which turns out to be much more valid than the derivation. This doesn't happen in mathematics, that the theorems come out in places where they're not supposed to be!

„I hope you accept Nature as She is — absurd.“

—  Richard Feynman, livro QED: The Strange Theory of Light and Matter

Fonte: QED: The Strange Theory of Light and Matter (1985), p. 10
Contexto: The theory of quantum electrodynamics describes Nature as absurd from the point of view of common sense. And it agrees fully with experiment. So I hope you accept Nature as She is — absurd.

„Have no respect whatsoever for authority; forget who said it and instead look what he starts with, where he ends up, and ask yourself, "Is it reasonable?"“

—  Richard Feynman, livro What Do You Care What Other People Think?

"What Do You Care What Other People Think?", p. 28-29
What Do You Care What Other People Think? (1988)
Contexto: Doubting the great Descartes … was a reaction I learned from my father: Have no respect whatsoever for authority; forget who said it and instead look what he starts with, where he ends up, and ask yourself, "Is it reasonable?"

„We are at the very beginning of time for the human race. It is not unreasonable that we grapple with problems. But there are tens of thousands of years in the future. Our responsibility is to do what we can, learn what we can, improve the solutions, and pass them on.“

—  Richard Feynman

The Value of Science (1955)
Contexto: We are at the very beginning of time for the human race. It is not unreasonable that we grapple with problems. But there are tens of thousands of years in the future. Our responsibility is to do what we can, learn what we can, improve the solutions, and pass them on.
... It is our responsibility to leave the people of the future a free hand. In the impetuous youth of humanity, we can make grave errors that can stunt our growth for a long time. This we will do if we say we have the answers now, so young and ignorant as we are. If we suppress all discussion, all criticism, proclaiming "This is the answer, my friends; man is saved!" we will doom humanity for a long time to the chains of authority, confined to the limits of our present imagination. It has been done so many times before.
... It is our responsibility as scientists, knowing the great progress which comes from a satisfactory philosophy of ignorance, the great progress which is the fruit of freedom of thought, to proclaim the value of this freedom; to teach how doubt is not to be feared but welcomed and discussed; and to demand this freedom as our duty to all coming generations.

„If our small minds, for some convenience, divide this glass of wine, this universe, into parts — physics, biology, geology, astronomy, psychology, and so on — remember that nature does not know it!“

—  Richard Feynman

volume I; lecture 3, "The Relation of Physics to Other Sciences"; section 3-7, "How did it get that way?"; p. 3-10
Contexto: A poet once said, "The whole universe is in a glass of wine." We will probably never know in what sense he meant that, for poets do not write to be understood. But it is true that if we look at a glass of wine closely enough we see the entire universe. There are the things of physics: the twisting liquid which evaporates depending on the wind and weather, the reflections in the glass, and our imagination adds the atoms. The glass is a distillation of the Earth's rocks, and in its composition we see the secrets of the universe's age, and the evolution of stars. What strange arrays of chemicals are in the wine? How did they come to be? There are the ferments, the enzymes, the substrates, and the products. There in wine is found the great generalization: all life is fermentation. Nobody can discover the chemistry of wine without discovering, as did Louis Pasteur, the cause of much disease. How vivid is the claret, pressing its existence into the consciousness that watches it! If our small minds, for some convenience, divide this glass of wine, this universe, into parts — physics, biology, geology, astronomy, psychology, and so on — remember that nature does not know it! So let us put it all back together, not forgetting ultimately what it is for. Let it give us one more final pleasure: drink it and forget it all!

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