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Richard Feynman

Geburtstag: 11. Mai 1918
Todesdatum: 15. Februar 1988
Andere Namen: Richard Feynman Philips, Richard Phillips Feynman, Ричард Филлипс Фейнман

Richard Phillips Feynman [ˈfaɪnmən] war ein US-amerikanischer Physiker und Nobelpreisträger des Jahres 1965.

Feynman gilt als einer der großen Physiker des 20. Jahrhunderts, der wesentliche Beiträge zum Verständnis der Quantenfeldtheorien geliefert hat. Zusammen mit Shin’ichirō Tomonaga und Julian Schwinger erhielt er 1965 den Nobelpreis für seine Arbeit zur Quantenelektrodynamik . Seine anschauliche Darstellung quantenfeldtheoretischer elementarer Wechselwirkungen durch Feynman-Diagramme ist heute ein De-facto-Standard.Für Feynman war es immer wichtig, die unanschaulichen Gesetzmäßigkeiten der Quantenphysik Laien und Studenten nahezubringen und verständlich zu machen. An Universitäten ist seine Vorlesungsreihe weit verbreitet. In Büchern wie QED: Die seltsame Theorie des Lichts und der Materie und Character of Physical Law wandte er sich an ein breiteres Publikum. Sein Charisma und die Fähigkeit, auf seine Zuhörerschaft einzugehen, ließen seine Vorlesungen und Vorträge legendär werden.

Seine unkonventionelle und nonkonformistische Art zeigte sich auch in seinen autobiographisch geprägten Büchern wie Sie belieben wohl zu scherzen, Mr. Feynman. Abenteuer eines neugierigen Physikers und Kümmert Sie, was andere Leute denken? In einem gleichnamigen Essay prägte er den Begriff der „Cargo-Kult-Wissenschaft“ für eine wissenschaftliche Disziplin, welche zwar der Form genügt, aber den Ansprüchen an den Inhalt nicht gerecht wird. Da der Begriff Cargo-Kult ursprünglich ein Verhaltensmuster von Ureinwohnern im Südpazifik beschrieb, zeigte dessen Verwendung in Bezug auf die Wissenschaft eine gewisse feinsinnige Respektlosigkeit.

Zitate Richard Feynman

„[Energie]"Es ist wichtig, einzusehen, dass wir in der heutigen Physik nicht wissen, was Energie ist. Wir haben kein Bild davon, dass Energie in kleinen Klumpen definierter Größe vorkommt."“

—  Richard Feynman

Vorlesungen über Physik, Band I, Kap. 4.1 (Übersetzung: Heinz Köhler), Seite 46, Oldenbourg München Wien, 5. Aufl. 2007
Original engl.: "It is important to realize that in physics today, we have no knowledge of what energy is. We do not have a picture that energy comes in little blobs of a definite amount."

„Der Trick sind die Idealisierungen. […] Dieses System ähnelt keineswegs dem der Mathematik, in welcher jedes Ding definiert werden kann, und dann wissen wir nicht, wovon wir reden. In der Tat ist es das Herrliche an der Mathematik, dass wir nicht sagen müssen, wovon wir reden. Das Herrliche liegt darin, dass die Gesetze, die Argumente und die Logik unabhängig davon sind, was "es" ist.“

—  Richard Feynman

Vorlesungen über Physik, Band I, Kap. 12.1 (Übersetzung: Heinz Köhler), Seite 165, Oldenbourg München Wien, 5. Aufl. 2007
Original englisch: "The trick is the idealizations. [...] This system is quite unlike the case of mathematics, in which everything can be defined, and then we do not know what we are talking about. In fact, the glory of mathematics is that we do not have to say what we are talking about. The glory is that the laws, the arguments, and the logic are independent of what 'it' is." - The Feynman Lectures on Physics: Quantum Mechanics. Addison-Wesley Pub. Co., 1965.

„Ein Philosoph hat einmal behaupet: 'Naturwissenschaft setzt notwendig voraus, dass gleiche Umstände immer auch gleiche Auswirkungen haben.' Nun, dem ist nicht so.“

—  Richard Feynman

Zitiert in Tony Hey und Patrick Walters: Das Quantenuniversum, Spektrum, Heidelberg 1990, ISBN 3-8274-0315-4 Kapitel 2 "Heisenberg und die quantenmechanische Unbestimmtheit" "Seite 33.
Original engl.: "A philosopher once said: 'It is necessary for the very existence of science that the same conditions always produce the same results'. Well, they do not." - The Character of Physical Law. A series of lectures recorded by the BBC at Cornell University. BBC 1965. Neuauflage Modern Library 1994

„Mir würde es gar nicht gefallen, zweimal zu sterben. Es ist so langweilig.“

—  Richard Feynman

Letzte Worte, 15. Februar 1988 - zu seiner Ehefrau, seiner Schwester und seiner Cousine, als er kurz aus einem durch Nierenversagen verursachten Koma erwachte.

„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."
Kontext: 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
Kontext: 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, buch 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)
Kontext: 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)
Kontext: 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."
Kontext: 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, buch The Character of Physical Law

Quelle: 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
Kontext: 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!

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„For a successful technology, reality must take precedence over public relations, for nature cannot be fooled.“

—  Richard Feynman

Rogers Commission Report (1986)
Kontext: Let us make recommendations to ensure that NASA officials deal in a world of reality in understanding technological weaknesses and imperfections well enough to be actively trying to eliminate them. They must live in reality in comparing the costs and utility of the Shuttle to other methods of entering space. And they must be realistic in making contracts, in estimating costs, and the difficulty of the projects. Only realistic flight schedules should be proposed, schedules that have a reasonable chance of being met. If in this way the government would not support them, then so be it. NASA owes it to the citizens from whom it asks support to be frank, honest, and informative, so that these citizens can make the wisest decisions for the use of their limited resources.
For a successful technology, reality must take precedence over public relations, for nature cannot be fooled.

„It is important to realize that in physics today, we have no knowledge what energy is.“

—  Richard Feynman

volume I; lecture 4, "Conservation of Energy"; section 4-1, "What is energy?"; p. 4-2
Kontext: It is important to realize that in physics today, we have no knowledge what energy is. We do not have a picture that energy comes in little blobs of a definite amount. It is not that way.

„It is not unscientific to make a guess, although many people who are not in science think it is.“

—  Richard Feynman, buch The Character of Physical Law

Quelle: The Character of Physical Law (1965), chapter 7, “Seeking New Laws,” p. 165-166: video http://www.youtube.com/watch?v=-2NnquxdWFk&t=37m21s
Kontext: It is not unscientific to make a guess, although many people who are not in science think it is. Some years ago I had a conversation with a layman about flying saucers — because I am scientific I know all about flying saucers! I said “I don’t think there are flying saucers”. So my antagonist said, “Is it impossible that there are flying saucers? Can you prove that it’s impossible?” “No”, I said, “I can’t prove it’s impossible. It’s just very unlikely”. At that he said, “You are very unscientific. If you can’t prove it impossible then how can you say that it’s unlikely?” But that is the way that is scientific. It is scientific only to say what is more likely and what less likely, and not to be proving all the time the possible and impossible. To define what I mean, I might have said to him, "Listen, I mean that from my knowledge of the world that I see around me, I think that it is much more likely that the reports of flying saucers are the results of the known irrational characteristics of terrestrial intelligence than of the unknown rational efforts of extra-terrestrial intelligence." It is just more likely. That is all.

„Agnostic for me would be trying to weasel out and sound a little nicer than I am about this.“

—  Richard Feynman

Response when asked whether he called himself an atheist or an agnostic. The Voice of Genius: Conversations with Nobel Scientists and Other Luminaries by Denis Brian (1995), Basic Books, p. 49.
Kontext: [I call myself] an atheist. Agnostic for me would be trying to weasel out and sound a little nicer than I am about this.

„This is not yet a scientific age.“

—  Richard Feynman

The Value of Science (1955)
Kontext: Is no one inspired by our present picture of the universe? This value of science remains unsung by singers, you are reduced to hearing not a song or poem, but an evening lecture about it. This is not yet a scientific age.

„While I am describing to you how Nature works, you won't understand why Nature works that way. But you see, nobody understands that.“

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

Quelle: QED: The Strange Theory of Light and Matter (1985), p. 10

„In this age of specialization men who thoroughly know one field are often incompetent to discuss another. The great problems of the relations between one and another aspect of human activity have for this reason been discussed less and less in public.“

—  Richard Feynman

remarks (2 May 1956) at a Caltech YMCA lunch forum http://calteches.library.caltech.edu/49/2/Religion.htm
Kontext: In this age of specialization men who thoroughly know one field are often incompetent to discuss another. The great problems of the relations between one and another aspect of human activity have for this reason been discussed less and less in public. When we look at the past great debates on these subjects we feel jealous of those times, for we should have liked the excitement of such argument. The old problems, such as the relation of science and religion, are still with us, and I believe present as difficult dilemmas as ever, but they are not often publicly discussed because of the limitations of specialization.

„I wanted very much to learn to draw, for a reason that I kept to myself: I wanted to convey an emotion I have about the beauty of the world.“

—  Richard Feynman

Part 5: "The World of One Physicist", "But Is It Art?", p. 261
Kontext: I wanted very much to learn to draw, for a reason that I kept to myself: I wanted to convey an emotion I have about the beauty of the world. It's difficult to describe because it's an emotion. It's analogous to the feeling one has in religion that has to do with a god that controls everything in the whole universe: there's a generality aspect that you feel when you think about how things that appear so different and behave so differently are all run "behind the scenes" by the same organization, the same physical laws. It's an appreciation of the mathematical beauty of nature, of how she works inside; a realization that the phenomena we see result from the complexity of the inner workings between atoms; a feeling of how dramatic and wonderful it is. It's a feeling of awe — of scientific awe — which I felt could be communicated through a drawing to someone who had also had this emotion. It could remind him, for a moment, of this feeling about the glories of the universe.

„You'll have to accept it. It's the way nature works. If you want to know how nature works, we looked at it, carefully. Looking at it, that's the way it looks. You don't like it? Go somewhere else, to another universe where the rules are simpler, philosophically more pleasing, more psychologically easy.“

—  Richard Feynman

Sir Douglas Robb Lectures, University of Auckland (1979); lecture 1, "Photons: Corpuscles of Light" https://www.youtube.com/watch?v=eLQ2atfqk2c&t=24m2s
Kontext: There's a kind of saying that you don't understand its meaning, 'I don't believe it. It's too crazy. I'm not going to accept it.'… You'll have to accept it. It's the way nature works. If you want to know how nature works, we looked at it, carefully. Looking at it, that's the way it looks. You don't like it? Go somewhere else, to another universe where the rules are simpler, philosophically more pleasing, more psychologically easy. I can't help it, okay? If I'm going to tell you honestly what the world looks like to the human beings who have struggled as hard as they can to understand it, I can only tell you what it looks like.

„It's a feeling of awe — of scientific awe — which I felt could be communicated through a drawing to someone who had also had this emotion. It could remind him, for a moment, of this feeling about the glories of the universe.“

—  Richard Feynman

Part 5: "The World of One Physicist", "But Is It Art?", p. 261
Kontext: I wanted very much to learn to draw, for a reason that I kept to myself: I wanted to convey an emotion I have about the beauty of the world. It's difficult to describe because it's an emotion. It's analogous to the feeling one has in religion that has to do with a god that controls everything in the whole universe: there's a generality aspect that you feel when you think about how things that appear so different and behave so differently are all run "behind the scenes" by the same organization, the same physical laws. It's an appreciation of the mathematical beauty of nature, of how she works inside; a realization that the phenomena we see result from the complexity of the inner workings between atoms; a feeling of how dramatic and wonderful it is. It's a feeling of awe — of scientific awe — which I felt could be communicated through a drawing to someone who had also had this emotion. It could remind him, for a moment, of this feeling about the glories of the universe.

„Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Etiam egestas wisi a erat. Morbi imperdiet, mauris ac auctor dictum.“

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