---
title: "72 Theory Quotes By Richard P. Feynman"
description: "72 Theory quotes by Richard P. Feynman. Plus more from Richard P. Feynman and more Theory sayings from other authors."
image: "https://sms4smile.com/quotes/i/870/richard-p-feynman-495_chemist_all-theoretical-chemistry-is-really-phys_584948.png"
---

> [All theoretical chemistry is really physics; and all theoretical chemists know it.](https://sms4smile.com/quotes/richard-p-feynman/all-theoretical-chemistry-is-really-physics-and-all-theoretical/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/870/richard-p-feynman-495_chemist_all-theoretical-chemistry-is-really-phys_584948.png)

> [No one really understands quantum mechanics.](https://sms4smile.com/quotes/richard-p-feynman/no-one-really-understands-quantum-mechanics/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/b7a/richard-p-feynman-495_mechanic_no-one-really-understands-quantum-mechan_2850412.png)

> [Another thing I must point out is that you cannot prove a vague theory wrong.](https://sms4smile.com/quotes/richard-p-feynman/another-thing-i-must-point-out-is-that-you-cannot-prove-a-vague/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/1f9/richard-p-feynman-495_prove_another-thing-i-must-point-out-is-that-y_2169472.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)

> [The electron is a theory. But the theory is so good we can almost consider them real.](https://sms4smile.com/quotes/richard-p-feynman/the-electron-is-a-theory-but-the-theory-is-so-good-we-can-almost/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/25f/richard-p-feynman-495_electron_the-electron-is-a-theory-but-the-theory_1797558.png)

> [What would happen if we could arrange the atoms one by one the way we want them?](https://sms4smile.com/quotes/richard-p-feynman/what-would-happen-if-we-could-arrange-the-atoms-one-by-one-the-way-we/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/e6d/richard-p-feynman-495_arrange_what-would-happen-if-we-could-arrange-th_3103764.png)

> [You can’t say A is made of B or vice versa. All mass is interaction.](https://sms4smile.com/quotes/richard-p-feynman/you-can-t-say-a-is-made-of-b-or-vice-versa-all-mass-is-interaction/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/0f6/richard-p-feynman-495_interaction_you-can-t-say-a-is-made-of-b-or-vice-ver_855732.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)

> [There is one simplification at least. Electrons behave ... in exactly the same way as photons; they are both screwy, but in…](https://sms4smile.com/quotes/richard-p-feynman/there-is-one-simplification-at-least-electrons-behave-in-exactly-the/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/d6b/richard-p-feynman-495_behave_there-is-one-simplification-at-least-ele_2487451.png)

> [From a long view of the history of mankind the most significant event of the nineteenth century will be judged as Maxwell's…](https://sms4smile.com/quotes/richard-p-feynman/from-a-long-view-of-the-history-of-mankind-the-most-significant-event/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/22e/richard-p-feynman-495_century_from-a-long-view-of-the-history-of-manki_1191070.png)

> [It doesn't matter how beautiful your theory is, it doesn't matter how smart you are. If it doesn't agree with experiment, it's…](https://sms4smile.com/quotes/richard-p-feynman/it-doesn-t-matter-how-beautiful-your-theory-is-it-doesn-t-matter-how/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/0bd/richard-p-feynman-495_agree_it-doesn-t-matter-how-beautiful-your-the_905816.png)

> [Atoms are very special: they like certain particular partners, certain particular directions, and so on. It is the job of physics to…](https://sms4smile.com/quotes/richard-p-feynman/atoms-are-very-special-they-like-certain-particular-partners-certain/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/ccb/richard-p-feynman-495_atoms_atoms-are-very-special-they-like-certain_3197524.png)

> [The electron is a theory we use; it is so useful in understanding the way nature works that we can almost call…](https://sms4smile.com/quotes/richard-p-feynman/the-electron-is-a-theory-we-use-it-is-so-useful-in-understanding-the/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/2c8/richard-p-feynman-495_electron_the-electron-is-a-theory-we-use-it-is-so_2139974.png)

> [If there is something very slightly wrong in our definition of the theories, then the full mathematical rigor may convert these errors…](https://sms4smile.com/quotes/richard-p-feynman/if-there-is-something-very-slightly-wrong-in-our-definition-of-the/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/482/richard-p-feynman-495_conclusion_if-there-is-something-very-slightly-wron_1146977.png)

> [We seem gradually to be groping toward an understanding of the world of subatomic particles, but we really do not know how…](https://sms4smile.com/quotes/richard-p-feynman/we-seem-gradually-to-be-groping-toward-an-understanding-of-the-world/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/639/richard-p-feynman-495_far_we-seem-gradually-to-be-groping-toward-a_330154.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)

> [The only way to have real success in science, the field I'm familiar with, is to describe the evidence very carefully without…](https://sms4smile.com/quotes/richard-p-feynman/the-only-way-to-have-real-success-in-science-the-field-i-m-familiar/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/1c3/richard-p-feynman-495_evidence_the-only-way-to-have-real-success-in-sci_2802633.png)

> [Working out another system to replace Newton's laws took a long time because phenomena at the atomic level were quite strange. One…](https://sms4smile.com/quotes/richard-p-feynman/working-out-another-system-to-replace-newton-s-laws-took-a-long-time/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/23c/richard-p-feynman-495_common-sense_working-out-another-system-to-replace-ne_673996.png)

> [We get the exciting result that the total energy of the universe is zero. Why this should be so is one of…](https://sms4smile.com/quotes/richard-p-feynman/we-get-the-exciting-result-that-the-total-energy-of-the-universe-is/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/27a/richard-p-feynman-495_energy_we-get-the-exciting-result-that-the-tota_1552971.png)

> [It always seems odd to me that the fundamental laws of physics, when discovered, can appear in so many different forms that…](https://sms4smile.com/quotes/richard-p-feynman/it-always-seems-odd-to-me-that-the-fundamental-laws-of-physics-when/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/694/richard-p-feynman-495_always_it-always-seems-odd-to-me-that-the-funda_2425511.jpg)

> [Things on a very small scale behave like nothing that you have any direct experience about. They do not behave like waves,…](https://sms4smile.com/quotes/richard-p-feynman/things-on-a-very-small-scale-behave-like-nothing-that-you-have-any-2/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/26c/richard-p-feynman-495_clouds_things-on-a-very-small-scale-behave-like_2928857.png)

> [People are always asking for the latest developments in the unification of this theory with that theory, and they don't give us…](https://sms4smile.com/quotes/richard-p-feynman/people-are-always-asking-for-the-latest-developments-in-the-2/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/76f/richard-p-feynman-495_always_people-are-always-asking-for-the-latest_1759546.jpg)

> [Because the theory of quantum mechanics could explain all of chemistry and the various properties of substances, it was a tremendous success.…](https://sms4smile.com/quotes/richard-p-feynman/because-the-theory-of-quantum-mechanics-could-explain-all-of/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/d66/richard-p-feynman-495_chemistry_because-the-theory-of-quantum-mechanics_3177176.png)

> [The first amazing fact about gravitation is that the ratio of inertial mass to gravitational mass is constant wherever we have checked…](https://sms4smile.com/quotes/richard-p-feynman/the-first-amazing-fact-about-gravitation-is-that-the-ratio-of/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/b81/richard-p-feynman-495_about_the-first-amazing-fact-about-gravitation_475345.png)

> [“there is a physical problem that is common to many fields, that is very old, and that has not been solved. It…](https://sms4smile.com/quotes/richard-p-feynman/there-is-a-physical-problem-that-is-common-to-many-fields-that-is/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/f8b/richard-p-feynman-495_long-time_there-is-a-physical-problem-that-is-comm_2890411.jpg)

> [The shell game that we play ... is technically called 'renormalization'. But no matter how clever the word, it is still what…](https://sms4smile.com/quotes/richard-p-feynman/the-shell-game-that-we-play-is-technically-called-renormalization-but/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/62f/richard-p-feynman-495_clever_the-shell-game-that-we-play-is-technical_2684050.jpg)

> [All things are made of atoms-little particles that move around in perpetual motion, attracting each other when they are a little distance…](https://sms4smile.com/quotes/richard-p-feynman/all-things-are-made-of-atoms-little-particles-that-move-around-in/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/b7d/richard-p-feynman-495_atoms_all-things-are-made-of-atoms-little-part_372333.png)

> [In fact, the science of thermodynamics began with an analysis, by the great engineer Sadi Carnot, of the problem of how to…](https://sms4smile.com/quotes/richard-p-feynman/in-fact-the-science-of-thermodynamics-began-with-an-analysis-by-the/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/b41/richard-p-feynman-495_analysis_in-fact-the-science-of-thermodynamics-be_1669360.jpg)

> [From a long view of the history of mankind, seen from, say, ten thousand years from now, there can be little doubt…](https://sms4smile.com/quotes/richard-p-feynman/from-a-long-view-of-the-history-of-mankind-seen-from-say-ten-thousand-2/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/f14/richard-p-feynman-495_19th-century_from-a-long-view-of-the-history-of-manki_3144130.jpg)

> [“The attempts to try to represent the electric field as the motion of some kind of gear wheels, or in terms of…](https://sms4smile.com/quotes/richard-p-feynman/the-attempts-to-try-to-represent-the-electric-field-as-the-motion-of/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/78c/richard-p-feynman-495_business_the-attempts-to-try-to-represent-the-ele_2563868.jpg)

> [To do any important work in physics a very good mathematical ability and aptitude are required. Some work in applications can be…](https://sms4smile.com/quotes/richard-p-feynman/to-do-any-important-work-in-physics-a-very-good-mathematical-ability/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/54a/richard-p-feynman-495_ability_to-do-any-important-work-in-physics-a-ve_2632071.jpg)

> [Thus we can get the correct answer for the probability of partial reflection by imagining (falsely) that all reflection comes from only…](https://sms4smile.com/quotes/richard-p-feynman/thus-we-can-get-the-correct-answer-for-the-probability-of-partial/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/cbb/richard-p-feynman-495_accurate_thus-we-can-get-the-correct-answer-for-t_1994320.jpg)

> [“If someone were to propose that the planets go around the sun because all planet matter has a kind of tendency for…](https://sms4smile.com/quotes/richard-p-feynman/if-someone-were-to-propose-that-the-planets-go-around-the-sun-because/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/3a9/richard-p-feynman-495_evidence_if-someone-were-to-propose-that-the-plan_2848915.jpg)

> [“There is a most profound and beautiful question associated with the observed coupling constant, e - the amplitude for a real electron…](https://sms4smile.com/quotes/richard-p-feynman/there-is-a-most-profound-and-beautiful-question-associated-with-the/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/f81/richard-p-feynman-495_fine-structure-const_there-is-a-most-profound-and-beautiful-q_2185407.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)

> [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)

> [Progress in science comes when experiments contradict theory.](https://sms4smile.com/quotes/richard-p-feynman/progress-in-science-comes-when-experiments-contradict-theory/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/13b/richard-p-feynman-495_experiments_progress-in-science-comes-when-experimen_1145989.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)

> [As usual, nature's imagination far surpasses our own, as we have seen from the other theories which are subtle and deep.](https://sms4smile.com/quotes/richard-p-feynman/as-usual-nature-s-imagination-far-surpasses-our-own-as-we-have-seen/)

[Richard P. Feynman](https://sms4smile.com/quotes/author/richard-p-feynman/)

[Image](https://sms4smile.com/quotes/i/842/richard-p-feynman-495_imagination_as-usual-nature-s-imagination-far-surpas_180578.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)

## Other authors on Theory

## 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/)

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                        "text": "The only way to have real success in science, the field I'm familiar with, is to describe the evidence very carefully without regard to the way you feel it should be. If you have a theory , you must try to explain what's good and what's bad about it equally. In science, you learn a kind of standard integrity and honesty .",
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                        "text": "Working out another system to replace Newton's laws took a long time because phenomena at the atomic level were quite strange. One had to lose one's common sense in order to perceive what was happening at the atomic level.",
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                        "text": "We get the exciting result that the total energy of the universe is zero. Why this should be so is one of the great mysteries - and therefore one of the important questions of physics. After all, what would be the use of studying physics if the mysteries were not the most important things to investigate?",
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                        "text": "Things on a very small scale behave like nothing that you have any direct experience about. They do not behave like waves, they do not behave like particles, they do not behave like clouds, or billiard balls, or weights on springs, or like anything that you have ever seen.",
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                        "text": "Because the theory of quantum mechanics could explain all of chemistry and the various properties of substances, it was a tremendous success. But still there was the problem of the interaction of light and matter.",
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                        "text": "The first amazing fact about gravitation is that the ratio of inertial mass to gravitational mass is constant wherever we have checked it. The second amazing thing about gravitation is how weak it is.",
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                        "text": "“there is a physical problem that is common to many fields, that is very old, and that has not been solved. It is not the problem of finding new fundamental particles, but something left over from a long time ago—over a hundred years. Nobody in physics has really been able to analyze it mathematically satisfactorily in spite of its importance to the sister sciences. It is the analysis of circulating or turbulent fluids.”",
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                        "text": "The shell game that we play ... is technically called 'renormalization'. But no matter how clever the word, it is still what I would call a dippy process! Having to resort to such hocus-pocus has prevented us from proving that the theory of quantum electrodynamics is mathematically self-consistent. It's surprising that the theory still hasn't been proved self-consistent one way or the other by now; I suspect that renormalization is not mathematically legitimate.",
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                        "text": "All things are made of atoms-little particles that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another. In that one sentence ... there is an enormous amount of information about the world. His suggestion that the most valuable information on scientific knowledge in a single sentence using the fewest words is to state the atomic hypothesis.",
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                        "text": "In fact, the science of thermodynamics began with an analysis, by the great engineer Sadi Carnot, of the problem of how to build the best and most efficient engine, and this constitutes one of the few famous cases in which engineering has contributed to fundamental physical theory. Another example that comes to mind is the more recent analysis of information theory by Claude Shannon. These two analyses, incidentally, turn out to be closely related.",
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                        "text": "From a long view of the history of mankind, seen from, say, ten thousand years from now, there can be little doubt that the most significant event of the 19th century will be judged as Maxwell's discovery of the laws of electrodynamics. The American Civil War will pale into provincial insignificance in comparison with this important scientific event of the same decade.",
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                        "text": "“The attempts to try to represent the electric field as the motion of some kind of gear wheels, or in terms of lines, or of stresses in some kind of material have used up more effort of physicists than it would have taken simply to get the right answers about electrodynamics. It is interesting that the correct equations for the behavior of light were worked out by MacCullagh in 1839. But people said to him: 'Yes, but there is no real material whose mechanical properties could possibly satisfy those equations, and since light is an oscillation that must vibrate in something, we cannot believe this abstract equation business'.”",
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                        "text": "To do any important work in physics a very good mathematical ability and aptitude are required. Some work in applications can be done without this, but it will not be very inspired. If you must satisfy your \"personal curiosity concerning the mysteries of nature\" what will happen if these mysteries turn out to be laws expressed in mathematical terms (as they do turn out to be)? You cannot understand the physical world in any deep or satisfying way without using mathematical reasoning with facility.",
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                        "text": "“There is a most profound and beautiful question associated with the observed coupling constant, e - the amplitude for a real electron to emit or absorb a real photon. It is a simple number that has been experimentally determined to be close to 0.08542455. (My physicist friends won't recognize this number, because they like to remember it as the inverse of its square: about 137.03597 with about an uncertainty of about 2 in the last decimal place. It has been a mystery ever since it was discovered more than fifty years ago, and all good theoretical physicists put this number up on their wall and worry about it.) Immediately you would like to know where this number for a coupling comes from: is it related to pi or perhaps to the base of natural logarithms? Nobody knows. It's one of the greatest damn mysteries of physics: a magic number that comes to us with no understanding by man. You might say the \"hand of God\" wrote that number, and \"we don't know how He pushed his pencil.\" We know what kind of a dance to do experimentally to measure this number very accurately, but we don't know what kind of dance to do on the computer to make this number come out, without putting it in secretly!”",
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