--- title: "73 Physics Quotes By Richard P. Feynman" description: "Physics quotes by Richard P. Feynman showcase curiosity, humility, and the role of imagination in science." image: "https://sms4smile.com/quotes/i/315/richard-p-feynman-495_fake_i-think-i-can-safely-say-that-nobody-und_1092616.png" --- > [I think I can safely say that nobody understands Quantum Mechanics.](https://sms4smile.com/quotes/richard-p-feynman/i-think-i-can-safely-say-that-nobody-understands-quantum-mechanics/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/315/richard-p-feynman-495_fake_i-think-i-can-safely-say-that-nobody-und_1092616.png) > [I think we can safely assume that no one understands quantum mechanics.](https://sms4smile.com/quotes/richard-p-feynman/i-think-we-can-safely-assume-that-no-one-understands-quantum-mechanics/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/2bc/richard-p-feynman-495_assuming_i-think-we-can-safely-assume-that-no-one_3035133.png) > [Turbulence is the most important unsolved problem of classical physics.](https://sms4smile.com/quotes/richard-p-feynman/turbulence-is-the-most-important-unsolved-problem-of-classical-physics/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/5db/richard-p-feynman-495_important_turbulence-is-the-most-important-unsolve_1570899.png) > [I, a universe of atoms, an atom in the universe.](https://sms4smile.com/quotes/richard-p-feynman/i-a-universe-of-atoms-an-atom-in-the-universe/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/0a8/richard-p-feynman-495_atoms_i-a-universe-of-atoms-an-atom-in-the-uni_2941706.png) > [If you think you understand quantum mechanics, you don't understand quantum mechanics.](https://sms4smile.com/quotes/richard-p-feynman/if-you-think-you-understand-quantum-mechanics-you-don-t-understand/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/674/richard-p-feynman-495_ifs_if-you-think-you-understand-quantum-mech_2695065.png) > [It is important to realize that in physics today, we have no knowledge of what energy is](https://sms4smile.com/quotes/richard-p-feynman/it-is-important-to-realize-that-in-physics-today-we-have-no-knowledge/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/470/richard-p-feynman-495_energy_it-is-important-to-realize-that-in-physi_3014602.png) > [The present situation in physics is as if we know chess, but we don't know one or two rules.](https://sms4smile.com/quotes/richard-p-feynman/the-present-situation-in-physics-is-as-if-we-know-chess-but-we-don-t/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/f29/richard-p-feynman-495_chess_the-present-situation-in-physics-is-as-i_2200695.png) > [Science is the belief in the ignorance of experts.](https://sms4smile.com/quotes/richard-p-feynman/science-is-the-belief-in-the-ignorance-of-experts/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/829/richard-p-feynman-495_belief_science-is-the-belief-in-the-ignorance-o_2229913.png) > [Physicists like to think that all you have to do is say, these are the conditions, now what happens next?](https://sms4smile.com/quotes/richard-p-feynman/physicists-like-to-think-that-all-you-have-to-do-is-say-these-are-the/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/545/richard-p-feynman-495_next_physicists-like-to-think-that-all-you-ha_2379057.png) > [ \[Quantum mechanics\] describes nature as absurd from the point of view of common sense. And yet it fully agrees with experiment. So… ](https://sms4smile.com/quotes/richard-p-feynman/quantum-mechanics-describes-nature-as-absurd-from-the-point-of-view/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/526/richard-p-feynman-495_absurd_quantum-mechanics-describes-nature-as-ab_2792894.jpg) > [So far as we know, all the fundamental laws of physics, like Newton's equations, are reversible.](https://sms4smile.com/quotes/richard-p-feynman/so-far-as-we-know-all-the-fundamental-laws-of-physics-like-newton-s/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/398/richard-p-feynman-495_equations_so-far-as-we-know-all-the-fundamental-la_2445640.png) > [As you know, a theory in physics is not useful unless it is able to predict underlined effects which we would otherwise…](https://sms4smile.com/quotes/richard-p-feynman/as-you-know-a-theory-in-physics-is-not-useful-unless-it-is-able-to/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/7ce/richard-p-feynman-495_able_as-you-know-a-theory-in-physics-is-not-u_291605.png) > [“THE QUESTION IS, OF COURSE, IS IT GOING TO BE POSSIBLE TO AMALGAMATE EVERYTHING, AND MERELY DISCOVER THAT THIS WORLD REPRESENTS DIFFERENT…](https://sms4smile.com/quotes/richard-p-feynman/the-question-is-of-course-is-it-going-to-be-possible-to-amalgamate/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/fc7/richard-p-feynman-495_feynman-lectures-on_the-question-is-of-course-is-it-going-to_2877610.png) > [We can deduce, often, from one part of physics like the law of gravitation, a principle which turns out to be much…](https://sms4smile.com/quotes/richard-p-feynman/we-can-deduce-often-from-one-part-of-physics-like-the-law-of/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/e92/richard-p-feynman-495_gravitation_we-can-deduce-often-from-one-part-of-phy_1931918.png) > [“I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to…](https://sms4smile.com/quotes/richard-p-feynman/i-can-live-with-doubt-and-uncertainty-and-not-knowing-i-think-it-s/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/378/richard-p-feynman-495_doubt_i-can-live-with-doubt-and-uncertainty-an_2109811.png) > [Have no respect whatsoever for authority; forget who said it and instead look what he starts with, where he ends up, and…](https://sms4smile.com/quotes/richard-p-feynman/have-no-respect-whatsoever-for-authority-forget-who-said-it-and/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/841/richard-p-feynman-495_ask-yourself_have-no-respect-whatsoever-for-authority_1697974.png) > [We do not know what the rules of the game are; all we are allowed to do is to watch the playing.…](https://sms4smile.com/quotes/richard-p-feynman/we-do-not-know-what-the-rules-of-the-game-are-all-we-are-allowed-to/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/9e7/richard-p-feynman-495_enough_we-do-not-know-what-the-rules-of-the-gam_325027.png) > [In a way, the Nobel Prize has been something of a pain in the neck, though there was at least one time…](https://sms4smile.com/quotes/richard-p-feynman/in-a-way-the-nobel-prize-has-been-something-of-a-pain-in-the-neck/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/04b/richard-p-feynman-495_celebration_in-a-way-the-nobel-prize-has-been-someth_3028502.png) > [“CURIOSITY DEMANDS THAT WE ASK QUESTIONS, THAT WE TRY TO PUT THINGS TOGETHER AND TRY TO UNDERSTAND THIS MULTITUDE OF ASPECTS AS…](https://sms4smile.com/quotes/richard-p-feynman/curiosity-demands-that-we-ask-questions-that-we-try-to-put-things/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/8cf/richard-p-feynman-495_ask-questions_curiosity-demands-that-we-ask-questions_1427057.png) > [ When the problem \[quantum chromodynamics\] is finally solved, it will all be by imagination. Then there will be some big thing about… ](https://sms4smile.com/quotes/richard-p-feynman/when-the-problem-quantum-chromodynamics-is-finally-solved-it-will-all/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/1df/richard-p-feynman-495_big-things_when-the-problem-quantum-chromodynamics_312736.jpg) > [Therefore psychologically we must keep all the theories in our heads, and every theoretical physicist who is any good knows six or…](https://sms4smile.com/quotes/richard-p-feynman/therefore-psychologically-we-must-keep-all-the-theories-in-our-heads/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/b45/richard-p-feynman-495_different_therefore-psychologically-we-must-keep-a_900983.png) > [Einstein's gravitational theory, which is said to be the greatest single achievement of theoretical physics, resulted in beautiful relations connecting gravitational phenomena…](https://sms4smile.com/quotes/richard-p-feynman/einstein-s-gravitational-theory-which-is-said-to-be-the-greatest/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/a00/richard-p-feynman-495_achievement_einstein-s-gravitational-theory-which-is_1156745.png) > [There was a time when the newspapers said that only twelve men understood the theory of relativity. I do not believe there…](https://sms4smile.com/quotes/richard-p-feynman/there-was-a-time-when-the-newspapers-said-that-only-twelve-men/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/9b1/richard-p-feynman-495_believe_there-was-a-time-when-the-newspapers-sai_2459627.png) > [It is the facts that matter, not the proofs. Physics can progress without the proofs, but we can't go on without the…](https://sms4smile.com/quotes/richard-p-feynman/it-is-the-facts-that-matter-not-the-proofs-physics-can-progress/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/bb4/richard-p-feynman-495_algebra_it-is-the-facts-that-matter-not-the-proo_1163195.jpg) > [ It is to be emphasized that no matter how many \[amplitude\] arrows we draw, add, or multiply, our objective is to calculate… ](https://sms4smile.com/quotes/richard-p-feynman/it-is-to-be-emphasized-that-no-matter-how-many-amplitude-arrows-we/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/94d/richard-p-feynman-495_add_it-is-to-be-emphasized-that-no-matter-ho_791144.jpg) > [“Are you looking for the ultimate laws of physics?" No, I'm not. I'm just looking to find out more about the world…](https://sms4smile.com/quotes/richard-p-feynman/are-you-looking-for-the-ultimate-laws-of-physics-no-i-m-not-i-m-just/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/f31/richard-p-feynman-495_laws-of-physics_are-you-looking-for-the-ultimate-laws-of_3060802.jpg) > [A poet once said, "The whole universe is in a glass of wine." We will probably never know in what sense he…](https://sms4smile.com/quotes/richard-p-feynman/a-poet-once-said-the-whole-universe-is-in-a-glass-of-wine-we-will-2/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/1fb/richard-p-feynman-495_astronomy_a-poet-once-said-the-whole-universe-is-i_1059422.jpg) > [It is going to be necessary that everything that happens in a finite volume of space and time would have to be…](https://sms4smile.com/quotes/richard-p-feynman/it-is-going-to-be-necessary-that-everything-that-happens-in-a-finite/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/800/richard-p-feynman-495_computer_it-is-going-to-be-necessary-that-everyth_388471.jpg) > [What is necessary for 'the very existence of science,' and what the characteristics of nature are, are not to be determined by…](https://sms4smile.com/quotes/richard-p-feynman/what-is-necessary-for-the-very-existence-of-science-and-what-the/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/bb6/richard-p-feynman-495_ahead-of-time_what-is-necessary-for-the-very-existence_383031.png) > [I think, however, that there isn't any solution to this problem of education other than to realize that the best teaching can…](https://sms4smile.com/quotes/richard-p-feynman/i-think-however-that-there-isn-t-any-solution-to-this-problem-of/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/ee8/richard-p-feynman-495_best-teaching_i-think-however-that-there-isn-t-any-sol_1302890.png) > [I don't like honors. I'm appreciated for the work that I did, and for people who appreciate it, and I notice that…](https://sms4smile.com/quotes/richard-p-feynman/i-don-t-like-honors-i-m-appreciated-for-the-work-that-i-did-and-for/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/46b/richard-p-feynman-495_appreciate_i-don-t-like-honors-i-m-appreciated-for_3229556.jpg) > [On the contrary, it's because somebody knows something about it that we can't talk about physics . It's the things that nobody…](https://sms4smile.com/quotes/richard-p-feynman/on-the-contrary-it-s-because-somebody-knows-something-about-it-that/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/cf0/richard-p-feynman-495_contrary_on-the-contrary-it-s-because-somebody-kn_520935.jpg) > [“If instead of arranging the atoms in some definite pattern, again and again repeated, on and on, or even forming little lumps…](https://sms4smile.com/quotes/richard-p-feynman/if-instead-of-arranging-the-atoms-in-some-definite-pattern-again-and/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/782/richard-p-feynman-495_atoms_if-instead-of-arranging-the-atoms-in-som_218563.jpg) > [“There was a Princess Somebody of Denmark sitting at a table with a number of people around her, and I saw an…](https://sms4smile.com/quotes/richard-p-feynman/there-was-a-princess-somebody-of-denmark-sitting-at-a-table-with-a/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/df9/richard-p-feynman-495_discuss_there-was-a-princess-somebody-of-denmark_26057.jpg) > [As revealed by physics, the truth is so remarkable, so amazing!](https://sms4smile.com/quotes/richard-p-feynman/as-revealed-by-physics-the-truth-is-so-remarkable-so-amazing/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/211/richard-p-feynman-495_inspirational_as-revealed-by-physics-the-truth-is-so-r_1905541.png) > [Physics isn't the most important thing. Love is.](https://sms4smile.com/quotes/richard-p-feynman/physics-isn-t-the-most-important-thing-love-is/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/8d9/richard-p-feynman-495_important_physics-isn-t-the-most-important-thing-l_620437.png) > [Physics is to mathematics what sex is to masturbation.](https://sms4smile.com/quotes/richard-p-feynman/physics-is-to-mathematics-what-sex-is-to-masturbation/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/b18/richard-p-feynman-495_masturbation_physics-is-to-mathematics-what-sex-is-to_3070483.png) > [If all of mathematics disappeared, physics would be set back by exactly one week.](https://sms4smile.com/quotes/richard-p-feynman/if-all-of-mathematics-disappeared-physics-would-be-set-back-by/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/31b/richard-p-feynman-495_ifs_if-all-of-mathematics-disappeared-physic_1144293.png) > [“I don't mind not knowing. It doesn't scare me.”](https://sms4smile.com/quotes/richard-p-feynman/i-don-t-mind-not-knowing-it-doesn-t-scare-me/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/342/richard-p-feynman-495_feynman_i-don-t-mind-not-knowing-it-doesn-t-scar_102386.png) > [Physics is like sex: sure, it may give some practical results, but that's not why we do it.](https://sms4smile.com/quotes/richard-p-feynman/physics-is-like-sex-sure-it-may-give-some-practical-results-but-that/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) [Image](https://sms4smile.com/quotes/i/580/richard-p-feynman-495_giving_physics-is-like-sex-sure-it-may-give-som_1582903.png) ## Other authors on Physics - [ ![](https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b003/author-albert-einstein-10494.jpg) Albert Einstein 85 quotes ](https://sms4smile.com/quotes/about/physics/albert-einstein/) - [ ![](https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b022/author-stephen-hawking-87021.jpg) Stephen Hawking 65 quotes ](https://sms4smile.com/quotes/about/physics/stephen-hawking/) - [ ![](https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b018/author-neil-degrasse-tyson-70683.jpg) Neil deGrasse Tyson 65 quotes ](https://sms4smile.com/quotes/about/physics/neil-degrasse-tyson/) - [ ![](https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b017/author-michio-kaku-67732.jpg) Michio Kaku 41 quotes ](https://sms4smile.com/quotes/about/physics/michio-kaku/) - [ ![](https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b008/author-deepak-chopra-28468.jpg) Deepak Chopra 30 quotes ](https://sms4smile.com/quotes/about/physics/deepak-chopra/) - [ ![](https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b005/author-brian-greene-19509.jpg) Brian Greene 27 quotes ](https://sms4smile.com/quotes/about/physics/brian-greene/) - [ ![](https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b010/author-frederick-lenz-36205.jpg) Frederick Lenz 25 quotes ](https://sms4smile.com/quotes/about/physics/frederick-lenz/) - [ ![](https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b023/author-swami-vivekananda-88348.jpg) Swami Vivekananda 23 quotes ](https://sms4smile.com/quotes/about/physics/swami-vivekananda/) - [ ![](https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b019/author-paul-davies-73861.jpg) Paul Davies 23 quotes ](https://sms4smile.com/quotes/about/physics/paul-davies/) - [ ![](https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b016/author-marcus-aurelius-63282.jpg) Marcus Aurelius 23 quotes ](https://sms4smile.com/quotes/about/physics/marcus-aurelius/) - [ ![](https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b006/author-carl-sagan-20994.jpg) Carl Sagan 23 quotes ](https://sms4smile.com/quotes/about/physics/carl-sagan/) - [ ![](https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b024/author-werner-heisenberg-94805.jpg) Werner Heisenberg 21 quotes ](https://sms4smile.com/quotes/about/physics/werner-heisenberg/) ## More by Richard P. Feynman > [“Philosophers have said before that one of the fundamental requisites of science is that whenever you set up the same conditions, the same thing…](https://sms4smile.com/quotes/richard-p-feynman/philosophers-have-said-before-that-one-of-the-fundamental-requisites/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) > [My rule is, when you are unhappy, think about it. But when you're happy, don't. Why spoil it? You're probably happy for some ridiculous…](https://sms4smile.com/quotes/richard-p-feynman/my-rule-is-when-you-are-unhappy-think-about-it-but-when-you-re-happy/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) > [Trying to understand the way nature works involves a most terrible test of human reasoning ability. It involves subtle trickery, beautiful tightropes of logic…](https://sms4smile.com/quotes/richard-p-feynman/trying-to-understand-the-way-nature-works-involves-a-most-terrible/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) > [Today's brains are yesterday's mashed potatoes.](https://sms4smile.com/quotes/richard-p-feynman/today-s-brains-are-yesterday-s-mashed-potatoes/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) > [Mathematics is a language plus reasoning; it is like a language plus logic. Mathematics is a tool for reasoning.](https://sms4smile.com/quotes/richard-p-feynman/mathematics-is-a-language-plus-reasoning-it-is-like-a-language-plus/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) > [It is necessary for the very existence of science that minds exist which do not allow that nature must satisfy some preconceived conditions.](https://sms4smile.com/quotes/richard-p-feynman/it-is-necessary-for-the-very-existence-of-science-that-minds-exist/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) > [“There was a Princess Somebody of Denmark sitting at a table with a number of people around her, and I saw an empty chair…](https://sms4smile.com/quotes/richard-p-feynman/there-was-a-princess-somebody-of-denmark-sitting-at-a-table-with-a/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) > [All the time you're saying to yourself, 'I could do that, but I won't,'--which is just another way of saying that you can't.](https://sms4smile.com/quotes/richard-p-feynman/all-the-time-you-re-saying-to-yourself-i-could-do-that-but-i-won-t/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) > [“There's a big difference between knowing the name of something and knowing something.”](https://sms4smile.com/quotes/richard-p-feynman/there-s-a-big-difference-between-knowing-the-name-of-something-and/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) > [The fact that you are not sure means that it is possible that there is another way someday.](https://sms4smile.com/quotes/richard-p-feynman/the-fact-that-you-are-not-sure-means-that-it-is-possible-that-there/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) > [You can always recognize truth by its beauty and simplicity.](https://sms4smile.com/quotes/richard-p-feynman/you-can-always-recognize-truth-by-its-beauty-and-simplicity/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) > [One cannot understand... the universality of laws of nature, the relationship of things, without an understanding of mathematics. There is no other way to…](https://sms4smile.com/quotes/richard-p-feynman/one-cannot-understand-the-universality-of-laws-of-nature-the/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) > [Mathematics is not just a language. Mathematics is a language plus reasoning.](https://sms4smile.com/quotes/richard-p-feynman/mathematics-is-not-just-a-language-mathematics-is-a-language-plus/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) > [A poet once said, "The whole universe is in a glass of wine." We will probably never know in what sense he meant that,…](https://sms4smile.com/quotes/richard-p-feynman/a-poet-once-said-the-whole-universe-is-in-a-glass-of-wine-we-will/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) > [I was a very shy character, always feeling uncomfortable because everybody was stronger than I, and always afraid I would look like a sissy.…](https://sms4smile.com/quotes/richard-p-feynman/i-was-a-very-shy-character-always-feeling-uncomfortable-because/) [Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/) ```json { "@context": "https://schema.org", "@graph": [ { "@type": "ItemList", "@id": "https://sms4smile.com/quotes/about/physics/richard-p-feynman/#itemlist", "name": "73 Physics Quotes By Richard P. Feynman", "numberOfItems": 40, "itemListElement": [ { "@type": "ListItem", "position": 1, "item": { "@type": "Quotation", "text": "I think I can safely say that nobody understands Quantum Mechanics.", "creator": { "@type": "Person", "name": "Richard P. 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Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 9, "item": { "@type": "Quotation", "text": "Physicists like to think that all you have to do is say, these are the conditions, now what happens next?", "creator": { "@type": "Person", "name": "Richard P. Feynman" }, "url": "https://sms4smile.com/quotes/richard-p-feynman/physicists-like-to-think-that-all-you-have-to-do-is-say-these-are-the/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/545/richard-p-feynman-495_next_physicists-like-to-think-that-all-you-ha_2379057.png", "contentUrl": "https://sms4smile.com/quotes/i/545/richard-p-feynman-495_next_physicists-like-to-think-that-all-you-ha_2379057.png", "url": "https://sms4smile.com/quotes/i/545/richard-p-feynman-495_next_physicists-like-to-think-that-all-you-ha_2379057.png", "width": 1080, "height": 1080, "caption": "“Physicists like to think that all you have to do is say, these are the conditions, now what happens next?” — Richard P. Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 10, "item": { "@type": "Quotation", "text": "[Quantum mechanics] describes nature as absurd from the point of view of common sense. And yet it fully agrees with experiment. So I hope you can accept nature as She is - absurd.", "creator": { "@type": "Person", "name": "Richard P. Feynman" }, "url": "https://sms4smile.com/quotes/richard-p-feynman/quantum-mechanics-describes-nature-as-absurd-from-the-point-of-view/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/526/richard-p-feynman-495_absurd_quantum-mechanics-describes-nature-as-ab_2792894.jpg", "contentUrl": "https://sms4smile.com/quotes/i/526/richard-p-feynman-495_absurd_quantum-mechanics-describes-nature-as-ab_2792894.jpg", "url": "https://sms4smile.com/quotes/i/526/richard-p-feynman-495_absurd_quantum-mechanics-describes-nature-as-ab_2792894.jpg", "width": 1080, "height": 1080, "caption": "“[Quantum mechanics] describes nature as absurd from the point of view of common sense. And yet it fully…” — Richard P. Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 11, "item": { "@type": "Quotation", "text": "So far as we know, all the fundamental laws of physics, like Newton's equations, are reversible.", "creator": { "@type": "Person", "name": "Richard P. Feynman" }, "url": "https://sms4smile.com/quotes/richard-p-feynman/so-far-as-we-know-all-the-fundamental-laws-of-physics-like-newton-s/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/398/richard-p-feynman-495_equations_so-far-as-we-know-all-the-fundamental-la_2445640.png", "contentUrl": "https://sms4smile.com/quotes/i/398/richard-p-feynman-495_equations_so-far-as-we-know-all-the-fundamental-la_2445640.png", "url": "https://sms4smile.com/quotes/i/398/richard-p-feynman-495_equations_so-far-as-we-know-all-the-fundamental-la_2445640.png", "width": 1080, "height": 1080, "caption": "“So far as we know, all the fundamental laws of physics, like Newton's equations, are reversible.” — Richard P. Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 12, "item": { "@type": "Quotation", "text": "As you know, a theory in physics is not useful unless it is able to predict underlined effects which we would otherwise expect.", "creator": { "@type": "Person", "name": "Richard P. Feynman" }, "url": "https://sms4smile.com/quotes/richard-p-feynman/as-you-know-a-theory-in-physics-is-not-useful-unless-it-is-able-to/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/7ce/richard-p-feynman-495_able_as-you-know-a-theory-in-physics-is-not-u_291605.png", "contentUrl": "https://sms4smile.com/quotes/i/7ce/richard-p-feynman-495_able_as-you-know-a-theory-in-physics-is-not-u_291605.png", "url": "https://sms4smile.com/quotes/i/7ce/richard-p-feynman-495_able_as-you-know-a-theory-in-physics-is-not-u_291605.png", "width": 1080, "height": 1080, "caption": "“As you know, a theory in physics is not useful unless it is able to predict underlined effects which we…” — Richard P. Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 13, "item": { "@type": "Quotation", "text": "“THE QUESTION IS, OF COURSE, IS IT GOING TO BE POSSIBLE TO AMALGAMATE EVERYTHING, AND MERELY DISCOVER THAT THIS WORLD REPRESENTS DIFFERENT ASPECTS OF ONE THING?”", "creator": { "@type": "Person", "name": "Richard P. Feynman" }, "url": "https://sms4smile.com/quotes/richard-p-feynman/the-question-is-of-course-is-it-going-to-be-possible-to-amalgamate/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/fc7/richard-p-feynman-495_feynman-lectures-on_the-question-is-of-course-is-it-going-to_2877610.png", "contentUrl": "https://sms4smile.com/quotes/i/fc7/richard-p-feynman-495_feynman-lectures-on_the-question-is-of-course-is-it-going-to_2877610.png", "url": "https://sms4smile.com/quotes/i/fc7/richard-p-feynman-495_feynman-lectures-on_the-question-is-of-course-is-it-going-to_2877610.png", "width": 1080, "height": 1080, "caption": "“THE QUESTION IS, OF COURSE, IS IT GOING TO BE POSSIBLE TO AMALGAMATE EVERYTHING, AND MERELY DISCOVER THAT…” — Richard P. Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 14, "item": { "@type": "Quotation", "text": "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.", "creator": { "@type": "Person", "name": "Richard P. Feynman" }, "url": "https://sms4smile.com/quotes/richard-p-feynman/we-can-deduce-often-from-one-part-of-physics-like-the-law-of/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/e92/richard-p-feynman-495_gravitation_we-can-deduce-often-from-one-part-of-phy_1931918.png", "contentUrl": "https://sms4smile.com/quotes/i/e92/richard-p-feynman-495_gravitation_we-can-deduce-often-from-one-part-of-phy_1931918.png", "url": "https://sms4smile.com/quotes/i/e92/richard-p-feynman-495_gravitation_we-can-deduce-often-from-one-part-of-phy_1931918.png", "width": 1080, "height": 1080, "caption": "“We can deduce, often, from one part of physics like the law of gravitation, a principle which turns out to…” — Richard P. Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 15, "item": { "@type": "Quotation", "text": "“I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers that might be wrong.”", "creator": { "@type": "Person", "name": "Richard P. Feynman" }, "url": "https://sms4smile.com/quotes/richard-p-feynman/i-can-live-with-doubt-and-uncertainty-and-not-knowing-i-think-it-s/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/378/richard-p-feynman-495_doubt_i-can-live-with-doubt-and-uncertainty-an_2109811.png", "contentUrl": "https://sms4smile.com/quotes/i/378/richard-p-feynman-495_doubt_i-can-live-with-doubt-and-uncertainty-an_2109811.png", "url": "https://sms4smile.com/quotes/i/378/richard-p-feynman-495_doubt_i-can-live-with-doubt-and-uncertainty-an_2109811.png", "width": 1080, "height": 1080, "caption": "“I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not…” — Richard P. Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 16, "item": { "@type": "Quotation", "text": "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?\"", "creator": { "@type": "Person", "name": "Richard P. Feynman" }, "url": "https://sms4smile.com/quotes/richard-p-feynman/have-no-respect-whatsoever-for-authority-forget-who-said-it-and/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/841/richard-p-feynman-495_ask-yourself_have-no-respect-whatsoever-for-authority_1697974.png", "contentUrl": "https://sms4smile.com/quotes/i/841/richard-p-feynman-495_ask-yourself_have-no-respect-whatsoever-for-authority_1697974.png", "url": "https://sms4smile.com/quotes/i/841/richard-p-feynman-495_ask-yourself_have-no-respect-whatsoever-for-authority_1697974.png", "width": 1080, "height": 1080, "caption": "“Have no respect whatsoever for authority; forget who said it and instead look what he starts with, where he…” — Richard P. Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 17, "item": { "@type": "Quotation", "text": "We do not know what the rules of the game are; all we are allowed to do is to watch the playing. Of course, if we watch long enough, we may eventually catch on to a few of the rules. The rules of the game are what we mean by fundamental physics.", "creator": { "@type": "Person", "name": "Richard P. 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Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 18, "item": { "@type": "Quotation", "text": "In a way, the Nobel Prize has been something of a pain in the neck, though there was at least one time that I got some fun out of it, Shortly after I won the Prize, Gweneth and I received an invitation from the Brazilian government to be the guests of honor at the Carnaval celebrations in Rio.", "creator": { "@type": "Person", "name": "Richard P. 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Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 20, "item": { "@type": "Quotation", "text": "When the problem [quantum chromodynamics] is finally solved, it will all be by imagination. Then there will be some big thing about the great way it was done. But it's simple -it will all be by imagination, and persistence.", "creator": { "@type": "Person", "name": "Richard P. 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Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 21, "item": { "@type": "Quotation", "text": "Therefore psychologically we must keep all the theories in our heads, and every theoretical physicist who is any good knows six or seven different theoretical representations for exactly the same physics.", "creator": { "@type": "Person", "name": "Richard P. 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Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 22, "item": { "@type": "Quotation", "text": "Einstein's gravitational theory, which is said to be the greatest single achievement of theoretical physics, resulted in beautiful relations connecting gravitational phenomena with the geometry of space; this was an exciting idea.", "creator": { "@type": "Person", "name": "Richard P. Feynman" }, "url": "https://sms4smile.com/quotes/richard-p-feynman/einstein-s-gravitational-theory-which-is-said-to-be-the-greatest/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/a00/richard-p-feynman-495_achievement_einstein-s-gravitational-theory-which-is_1156745.png", "contentUrl": "https://sms4smile.com/quotes/i/a00/richard-p-feynman-495_achievement_einstein-s-gravitational-theory-which-is_1156745.png", "url": "https://sms4smile.com/quotes/i/a00/richard-p-feynman-495_achievement_einstein-s-gravitational-theory-which-is_1156745.png", "width": 1080, "height": 1080, "caption": "“Einstein's gravitational theory, which is said to be the greatest single achievement of theoretical physics…” — Richard P. 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Physics can progress without the proofs, but we can't go on without the facts ... if the facts are right, then the proofs are a matter of playing around with the algebra correctly.", "creator": { "@type": "Person", "name": "Richard P. Feynman" }, "url": "https://sms4smile.com/quotes/richard-p-feynman/it-is-the-facts-that-matter-not-the-proofs-physics-can-progress/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/bb4/richard-p-feynman-495_algebra_it-is-the-facts-that-matter-not-the-proo_1163195.jpg", "contentUrl": "https://sms4smile.com/quotes/i/bb4/richard-p-feynman-495_algebra_it-is-the-facts-that-matter-not-the-proo_1163195.jpg", "url": "https://sms4smile.com/quotes/i/bb4/richard-p-feynman-495_algebra_it-is-the-facts-that-matter-not-the-proo_1163195.jpg", "width": 1080, "height": 1080, "caption": "“It is the facts that matter, not the proofs. Physics can progress without the proofs, but we can't go on…” — Richard P. 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Feynman" }, "url": "https://sms4smile.com/quotes/richard-p-feynman/it-is-to-be-emphasized-that-no-matter-how-many-amplitude-arrows-we/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/94d/richard-p-feynman-495_add_it-is-to-be-emphasized-that-no-matter-ho_791144.jpg", "contentUrl": "https://sms4smile.com/quotes/i/94d/richard-p-feynman-495_add_it-is-to-be-emphasized-that-no-matter-ho_791144.jpg", "url": "https://sms4smile.com/quotes/i/94d/richard-p-feynman-495_add_it-is-to-be-emphasized-that-no-matter-ho_791144.jpg", "width": 1080, "height": 1080, "caption": "“It is to be emphasized that no matter how many [amplitude] arrows we draw, add, or multiply, our objective…” — Richard P. Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 26, "item": { "@type": "Quotation", "text": "“Are you looking for the ultimate laws of physics?\" No, I'm not. I'm just looking to find out more about the world and if it turns out there is a simple ultimate law which explains everything, so be it; that would be very nice to discover. If it turns out it's like an onion with millions of layers and we're just sick and tired of looking at the layers, then that's the way it is. ... My interest in science is to simply find out more about the world.”", "creator": { "@type": "Person", "name": "Richard P. 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Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 27, "item": { "@type": "Quotation", "text": "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... 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!", "creator": { "@type": "Person", "name": "Richard P. Feynman" }, "url": "https://sms4smile.com/quotes/richard-p-feynman/a-poet-once-said-the-whole-universe-is-in-a-glass-of-wine-we-will-2/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/1fb/richard-p-feynman-495_astronomy_a-poet-once-said-the-whole-universe-is-i_1059422.jpg", "contentUrl": "https://sms4smile.com/quotes/i/1fb/richard-p-feynman-495_astronomy_a-poet-once-said-the-whole-universe-is-i_1059422.jpg", "url": "https://sms4smile.com/quotes/i/1fb/richard-p-feynman-495_astronomy_a-poet-once-said-the-whole-universe-is-i_1059422.jpg", "width": 1080, "height": 1080, "caption": "“A poet once said, \"The whole universe is in a glass of wine.\" We will probably never know in what sense he…” — Richard P. Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 28, "item": { "@type": "Quotation", "text": "It is going to be necessary that everything that happens in a finite volume of space and time would have to be analyzable with a finite number of logical operations. The present theory of physics is not that way, apparently. It allows space to go down into infinitesimal distances, wavelengths to get infinitely great, terms to be summed in infinite order, and so forth; and therefore, if this proposition [that physics is computer-simulatable] is right, physical law is wrong.", "creator": { "@type": "Person", "name": "Richard P. 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Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 29, "item": { "@type": "Quotation", "text": "What is necessary for 'the very existence of science,' and what the characteristics of nature are, are not to be determined by pompous preconditions, they are determined always by the material with which we work, by nature herself. We look, and we see what we find, and we cannot say ahead of time successfully what it is going to look like. ... It is necessary for the very existence of science that minds exist which do not allow that nature must satisfy some preconceived conditions.", "creator": { "@type": "Person", "name": "Richard P. Feynman" }, "url": "https://sms4smile.com/quotes/richard-p-feynman/what-is-necessary-for-the-very-existence-of-science-and-what-the/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/bb6/richard-p-feynman-495_ahead-of-time_what-is-necessary-for-the-very-existence_383031.png", "contentUrl": "https://sms4smile.com/quotes/i/bb6/richard-p-feynman-495_ahead-of-time_what-is-necessary-for-the-very-existence_383031.png", "url": "https://sms4smile.com/quotes/i/bb6/richard-p-feynman-495_ahead-of-time_what-is-necessary-for-the-very-existence_383031.png", "width": 1080, "height": 1080, "caption": "“What is necessary for 'the very existence of science,' and what the characteristics of nature are, are not…” — Richard P. Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 30, "item": { "@type": "Quotation", "text": "I think, however, that there isn't any solution to this problem of education other than to realize that the best teaching can be done only when there is a direct individual relationship between a student and a good teacher - a situation in which the student discusses the ideas, thinks about the things, and talks about the things. It's impossible to learn very much by simply sitting in a lecture, or even by simply doing problems that are assigned. But in our modern times we have so many students to teach that we have to try to find some substitute for the ideal.", "creator": { "@type": "Person", "name": "Richard P. 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I'm appreciated for the work that I did, and for people who appreciate it, and I notice that other physicists use my work. I don't need anything else. I don't think there's any sense to anything else… I've already got the prize. The prize is the pleasure of finding the thing out, the kick in the discovery, the observation that other people use it. Those are the real things. The honors are unreal to me. I don't believe in honors... I can't stand it, it hurts me.", "creator": { "@type": "Person", "name": "Richard P. 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Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 32, "item": { "@type": "Quotation", "text": "On the contrary, it's because somebody knows something about it that we can't talk about physics . It's the things that nobody knows anything about that we can discuss. We can talk about the weather; we can talk about social problems; we can talk about psychology; we can talk about international finance gold transfers we can't talk about, because those are understood so it's the subject that nobody knows anything about that we can all talk about!", "creator": { "@type": "Person", "name": "Richard P. 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Feynman", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 34, "item": { "@type": "Quotation", "text": "“There was a Princess Somebody of Denmark sitting at a table with a number of people around her, and I saw an empty chair at their table and sat down. She turned to me and said, \"Oh! You're one of the Nobel-Prize-winners. In what field did you do your work?\" \"In physics,\" I said. \"Oh. Well, nobody knows anything about that, so I guess we can't talk about it.\" \"On the contrary,\" I answered. \"It's because somebody knows something about it that we can't talk about physics. It's the things that nobody knows anything about that we can discuss. We can talk about the weather; we can talk about social problems; we can talk about psychology; we can talk about international finance--gold transfers we can't talk about, because those are understood--so it's the subject that nobody knows anything about that we can all talk about!\" I don't know how they do it. There's a way of forming ice on the surface of the face, and she did it!”", "creator": { "@type": "Person", "name": "Richard P. 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