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'conservation' (the Conservation Law) Means This ... That There Is A Number, Which You Can Calculate, At One Moment-and As Nature Undergoes Its Multitude Of Changes, This Number Doesn't Change. That Is, If You Calculate Again, This Quantity, It'll Be The Same As It Was Before. An Example Is The Conservation Of Energy: There's A Quantity That You Can Calculate According To A Certain Rule, And It Comes Out The Same Answer After, No Matter What Happens, Happens.

-Richard P. Feynman

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'conservation' (the Conservation Law)

Richard P. Feynman

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'conservation' (the Conservation Law) Means This ... That There Is A Number, Which You Can Calculate, At One Moment-and As Nature Undergoes Its Multitude Of Changes, This Number Doesn't Change. That Is, If You Calculate Again, This Quantity, It'll Be The Same As It Was Before. An Example Is The Conservation Of Energy: There's A Quantity That You Can Calculate According To A Certain Rule, And It Comes Out The Same Answer After, No Matter What Happens, Happens.

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More From Richard P. Feynman

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.

Possible And Impossible

So I Have Just One Wish For You – The Good Luck To Be Somewhere Where You Are Free To Maintain The Kind Of Integrity I Have Described, And Where You Do Not Feel Forced By A Need To Maintain Your Position In The Organization, Or Financial Support, Or So On, To Lose Your Integrity. May You Have That Freedom.

You Do Not Know Anything Until You Have Practiced.

No! Not For A Second! I Immediately Began To Think How This Could Have Happened. And I Realized That The Clock Was Old And Was Always Breaking. That The Clock Probably Stopped Some Time Before And The Nurse Coming In To The Room To Record The Time Of Death Would Have Looked At The Clock And Jotted Down The Time From That. I Never Made Any Supernatural Connection, Not Even For A Second. I Just Wanted To Figure Out How It Happened.

This Attitude Of Mind - This Attitude Of Uncertainty - Is Vital To The Scientist, And It Is This Attitude Of Mind Which The Student Must First Acquire. It Becomes A Habit Of Thought. Once Acquired, We Cannot Retreat From It Anymore.

So, Ultimately, In Order To Understand Nature It May Be Necessary To Have A Deeper Understanding Of Mathematical Relationships. But The Real Reason Is That The Subject Is Enjoyable, And Although We Humans Cut Nature Up In Different Ways, And We Have Different Courses In Different Departments, Such Compartmentaliz Ation Is Really Artificial, And We Should Take Our Intellectual Pleasures Where We Find Them.

The Unanswerable Mysteries... The Attitude That All Is Uncertain... To Summarize It - The Humility Of The Intellect.

I Am Not Interested In What Today's Mathematicians Find Interesting.

A Poet Once Said, "the Whole Universe Is In A Glass Of Wine." We Will Probably Never Know In What Sense He Meant That, For Poets Do Not Write To Be Understood. But It Is True That If We Look At A Glass Of Wine Closely Enough We See The Entire Universe.

Any Schemes - Such As 'think Of Symmetry Laws', Or 'put The Information In Mathematical Form', Or 'guess Equations'- Are Known To Everybody Now, And They Are All Tried All The Time. When You Are Stuck, The Answer Cannot Be One Of These, Because You Will Have Tried These Right Away...the Next Scheme, The New Discovery, Is Going To Be Made In A Completely Different Way.

One Of The Ways Of Stopping Science Would Be Only To Do Experiments In The Region Where You Know The Law. But Experimenters Search Most Diligently, And With The Greatest Effort, In Exactly Those Places Where It Seems Most Likely That We Can Prove Our Theories Wrong. In Other Words, We Are Trying To Prove Ourselves Wrong As Quickly As Possible, Because Only In That Way Can We Find Progress.

When A Photon Comes Down, It Interacts With Electrons Throughout The Glass, Not Just On The Surface. The Photon And Electrons Do Some Kind Of Dance, The Net Result Of Which Is The Same As If The Photon Hit Only On The Surface.

There In Wine Is Found The Great Generalization: All Life Is Fermentation.

Poets Say Science Takes Away From The Beauty Of The Stars - Mere Globs Of Gas Atoms. I, Too, Can See The Stars On A Desert Night, And Feel Them. But Do I See Less Or More?

The Chance Is High That The Truth Lies In The Fashionable Direction. But, On The Off-chance That It Is In Another Direction - A Direction Obvious From An Unfashionable View Of Field Theory - Who Will Find It? Only Someone Who Has Sacrificed Himself By Teaching Himself Quantum Electrodynamics From A Peculiar And Unusual Point Of View; One That He May Have To Invent For Himself.

The Female Mind Is Capable Of Understanding Analytic Geometry... The Difficulty May Just Be That We Have Never Yet Discovered A Way To Communicate With The Female Mind. If It Is Done In The Right Way, You May Be Able To Get Something Out Of It.

(joan,1941) She Wrote Me A Letter Asking,"how Can I Read It?,its So Hard." I Told Her To Start At The Beginning And Read As Far As You Can Get Until You're Lost. Then Start Again At The Beginning And Keep Working Through Until You Can Understand The Whole Book. And Thats What She Did

The Electron Is A Theory. But The Theory Is So Good We Can Almost Consider Them Real.

Nature Has A Great Simplicity And Therefore A Great Beauty.

I Don't Think That The Laws Can Be Considered To Be Like God Because They Have Been Figured Out.

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.

There’s So Much Distance Between The Fundamental Rules And The Final Phenomenon, That It’s Almost Unbelievable That The Final Variety Of Phenomenon Can Come From Such A Steady Operation Of Such Simple Rules.

Looking Back At The Worst Times, It Always Seems That They Were Times In Which There Were People Who Believed With Absolute Faith And Absolute Dogmatism In Something. And They Were So Serious In This Matter That They Insisted That The Rest Of The World Agree With Them. And Then They Would Do Things That Were Directly Inconsistent With Their Own Beliefs In Order To Maintain That What They Said Was True.

There Are Theoretical Physicists Who Imagine, Deduce, And Guess At New Laws, But Do Not Experiment; And Then There Are Experimental Physicists Who Experiment, Imagine, Deduce, And Guess.

I, A Universe Of Atoms, An Atom In The Universe.

Tell Your Son To Stop Trying To Fill Your Head With Science - For To Fill Your Heart With Love Is Enough!

I Don't Have To Be Good Because They Think I'm Going To Be Good.

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.

What Do I Advise? Forget It All. Don't Be Afraid. Do What You Get The Most Pleasure From. Is It To Build A Cloud Chamber? Then Go On Doing Things Like That. Develop Your Talents Wherever They May Lead. Damn The Torpedoes - Full Speed Ahead!if You Have Any Talent,or Any Occupation That Delights You,do It, And Do It To The Hilt

Everybody Who Reasons Carefully About Anything Is Making A Contribution ... And If You Abstract It Away And Send It To The Department Of Mathematics They Put It In Books.

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 In Some Doubt.

Philosophy Of Science Is About As Useful To Scientists As Ornithology Is To Birds.

Thank You Very Much, I Enjoyed Myself

We Absolutely Must Leave Room For Doubt Or There Is No Progress And There Is No Learning. There Is No Learning Without Having To Pose A Question. And A Question Requires Doubt. People Search For Certainty. But There Is No Certainty. People Are Terrified — How Can You Live And Not Know? It Is Not Odd At All. You Only Think You Know, As A Matter Of Fact. And Most Of Your Actions Are Based On Incomplete Knowledge And You Really Don’t Know What It Is All About, Or What The Purpose Of The World Is, Or Know A Great Deal Of Other Things. It Is Possible To Live And Not Know.

Incomplete Knowledge

It Is Our Responsibility To Leave The People Of The Future A Free Hand.

We Are Very Lucky To Be Living In An Age In Which We Are Still Making Discoveries. It Is Like The Discovery Of America-you Only Discover It Once. The Age In Which We Live Is The Age In Which We Are Discovering The Fundamental Laws Of Nature, And That Day Will Never Come Again. It Is Very Exciting, It Is Marvelous, But This Excitement Will Have To Go.

No Government Has The Right To Decide On The Truth Of Scientific Principles, Nor To Prescribe In Any Way The Character Of The Questions Investigated. Neither May A Government Determine The Aesthetic Value Of Artistic Creations, Nor Limit The Forms Of Literacy Or Artistic Expression. Nor Should It Pronounce On The Validity Of Economic, Historic, Religious, Or Philosophical Doctrines. Instead It Has A Duty To Its Citizens To Maintain The Freedom, To Let Those Citizens Contribute To The Further Adventure And The Development Of The Human Race.

Our Responsibility Is To Do What We Can, Learn What We Can, Improve The Solutions, And Pass Them On.

Phenomena Complex-laws Simple....know What To Leave Out.

In Fact The Total Amount That A Physicist Knows Is Very Little. He Has Only To Remember The Rules To Get Him From One Place To Another And He Is All Right.

Turbulence Is The Most Important Unsolved Problem Of Classical Physics.

Teach Principles Not Formulas.

It Is Important To Realize That In Physics Today, We Have No Knowledge Of What Energy Is

If All Of This, All The Life Of A Stream Of Water, Can Be Nothing But A Pile Of Atoms, How Much More Is Possible?

We Have A Habit In Writing Articles Published In Scientific Journals To Make The Work As Finished As Possible, To Cover Up All The Tracks, To Not Worry About The Blind Alleys Or Describe How You Had The Wrong Idea First, And So On. So There Isn't Any Place To Publish, In A Dignified Manner, What You Actually Did In Order To Get To Do The Work, Although, There Has Been In These Days, Some Interest In This Kind Of Thing.

From A Long View Of The History Of Mankind The Most Significant Event Of The Nineteenth Century Will Be Judged As Maxwell's Discovery Of The Laws Of Electrodynamics.

I'm Smart Enough To Know That I'm Dumb.

I'd Hate To Die Twice. It's So Boring.

There Is No Learning Without Having To Pose A Question. And A Question Requires Doubt.

The Difficulty Really Is Psychological And Exists In The Perpetual Torment That Results From Your Saying To Yourself, "but How Can It Be Like That?" Which Is A Reflection Of Uncontrolled But Utterly Vain Desire To See It In Terms Of Something Familiar. ... If You Will Simply Admit That Maybe Nature Does Behave Like This, You Will Find Her A Delightful, Entrancing Thing. Do Not Keep Saying To Yourself, If You Can Possible Avoid It, "but How Can It Be Like That?" Because You Will Get 'down The Drain', Into A Blind Alley From Which Nobody Has Escaped. Nobody Knows How It Can Be Like That.

When You Get As Old As I Am, You Start To Realize That You've Told Most Of The Good Stuff You Know To Other People Anyway.

If I Say [electrons] Behave Like Particles I Give The Wrong Impression; Also If I Say They Behave Like Waves. They Behave In Their Own Inimitable Way, Which Technically Could Be Called A Quantum Mechanical Way. They Behave In A Way That Is Like Nothing That You Have Seen Before.

It's Amazing How Many People Even Today Use A Computer To Do Something You Can Do With A Pencil And Paper In Less Time.

It Is To Be Emphasized That No Matter How Many [amplitude] Arrows We Draw, Add, Or Multiply, Our Objective Is To Calculate A Single Final Arrow For The Event . Mistakes Are Often Made By Physics Students At First Because They Do Not Keep This Important Point In Mind. They Work For So Long Analyzing Events Involving A Single Photon That They Begin To Think That The Arrow Is Somehow Associated With The Photon [rather Than With The Event].

I Have The Advantage Of Having Found Out How Hard It Is To Get To Really Know Something. How Careful You Have To Be About Checking Your Experiments. How Easy It Is To Make Mistakes And Fool Yourself. I Know What It Means To Know Something.

But There Is Nothing In Biology Yet Found That Indicates The Inevitability Of Death.

Inevitability Of Death

If We Will Only Allow That, As We Progress, We Remain Unsure, We Will Leave Opportunities For Alternatives.

Start Out Understanding Religion By Saying Everything Is Possibly Wrong... As Soon As You Do That, You Start Sliding Down An Edge Which Is Hard To Recover From.

It Doesn't Seem To Me That This Fantastically Marvelous Universe, This Tremendous Range Of Time And Space And Different Kinds Of Animals, And All The Different Planets, And All These Atoms With All Their Motions, And So On, All This Complicated Thing Can Merely Be A Stage So That God Can Watch Human Beings Struggle For Good And Evil - Which Is The View That Religion Has. The Stage Is Too Big For The Drama.

Some People Say, "how Can You Live Without Knowing?" I Do Not Know What They Mean. I Always Live Without Knowing. That Is Easy. How You Get To Know Is What I Want To Know.

Science Is Of Value Because It Can Produce Something.

There Is Nothing In Biology Yet Found That Indicates The Inevitability Of Death. This Suggests To Me That It Is Not At All Inevitable And That It Is Only A Matter Of Time Before Biologists Discover What It Is That Is Causing Us The Trouble.

Inevitability Of Death

... It Is Impossible To Explain Honestly The Beauties Of The Laws Of Nature In A Way That People Can Feel, Without Their Having Some Deep Understanding Of Mathematics. I Am Sorry, But This Seems To Be The Case.

Nature Isn't Classical, Dammit, And If You Want To Make A Simulation Of Nature, You'd Better Make It Quantum Mechanical, And By Golly It's A Wonderful Problem, Because It Doesn't Look So Easy.

Ordinary Fools Are All Right; You Can Talk To Them, And Try To Help Them Out. But Pompous Fools-guys Who Are Fools And Are Covering It All Over And Impressing People As To How Wonderful They Are With All This Hocus Pocus-that, I Cannot Stand! An Ordinary Fool Isn't A Faker; An Honest Fool Is All Right. But A Dishonest Fool Is Terrible!

John Von Neumann Gave Me An Interesting Idea: That You Don't Have To Be Responsible For The World That You're In. So I Have Developed A Very Powerful Sense Of Social Irresponsibility As A Result Of Von Neumann's Advice. It's Made Me A Very Happy Man Ever Since. But It Was Von Neumann Who Put The Seed In That Grew Into My Active Irresponsibility!

If You Thought You Were Trying To Find Out More About It Because You're Gonna Get An Answer To Some Deep Philosophical Question...you May Be Wrong! It May Be That You Can't Get An Answer To That Particular Question By Finding Out More About The Character Of Nature. But My Interest In Science Is To Simply Find Out About The World.

You See, The Chemists Have A Complicated Way Of Counting: Instead Of Saying "one, Two, Three, Four, Five Protons", They Say, "hydrogen, Helium, Lithium, Beryllium, Boron."

You Know How It Always Is, Every New Idea, It Takes A Generation Or Two Until It Becomes Obvious That There's No Real Problem. It Has Not Yet Become Obvious To Me That There's No Real Problem. I Cannot Define The Real Problem, Therefore I Suspect There's No Real Problem, But I'm Not Sure There's No Real Problem.

It Does Not Make Any Difference How Beautiful Your Guess Is. It Does Not Make Any Difference How Smart You Are, Who Made The Guess, Or What His Name Is If It Disagrees With Experiment It Is Wrong. That Is All There Is To It.

It Is Odd, But On The Infrequent Occasions When I Have Been Called Upon In A Formal Place To Play The Bongo Drums, The Introducer Never Seems To Find It Necessary To Mention That I Also Do Theoretical Physics.

Theoretical Physics

The Beauty That Is There Is Also Available For Me, Too. But I See A Deeper Beauty That Isn't So Readily Available To Others.... I Don't See How Studying A Flower Ever Detracts From Its Beauty. It Only Adds

You Can’t Say A Is Made Of B Or Vice Versa. All Mass Is Interaction.

Science Is The Organized Skepticism In The Reliability Of Expert Opinion

The Only Way To Deep Happiness Is To Do Something You Love To The Best Of Your Ability

People Often Think I'm A Faker, But I'm Usually Honest, In A Certain Way--in Such A Way That Often Nobody Believes Me!

It Turns Out That All Life Is Interconnected With All Other Life.

It Is The Facts That Matter, Not The Proofs. 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.

Some People Think Wheeler's Gotten Crazy In His Later Years, But He's Always Been Crazy.

Whenever You See A Sweeping Statement That A Tremendous Amount Can Come From A Very Small Number Of Assumptions, You Always Find That It Is False. There Are Usually A Large Number Of Implied Assumptions That Are Far From Obvious If You Think About Them Sufficiently Carefully.

Unless A Thing Can Be Defined By Measurement, It Has No Place In A Theory. And Since An Accurate Value Of The Momentum Of A Localized Particle Cannot Be Defined By Measurement It Therefore Has No Place In The Theory.

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.

If You Know That You Are Not Sure, You Have A Chance To Improve The Situation. I Want To Demand This Freedom For Future Generations.

We Are At The Very Beginning Of Time For The Human Race. It Is Not Unreasonable That We Grapple With Problems. But There Are Tens Of Thousands Of Years In The Future. Our Responsibility Is To Do What We Can, Learn What We Can, Improve The Solutions, And Pass Them On.

The Present Situation In Physics Is As If We Know Chess, But We Don't Know One Or Two Rules.

I Think It's Much More Interesting To Live Not Knowing Than To Have Answers Which Might Be Wrong.

My Friends And I Had Taken Dancing Lessons, Although None Of Us Would Ever Admit It. In Those Depression Days, A Friend Of My Mother Was Trying To Make A Living By Teaching Dancing In The Evening, In An Upstairs Dance Studio. There Was A Back Door To The Place, And She Arranged It So The Young Men Could Come Up Through The Back Way Without Being Seen.

The Whole Question Of Imagination In Science Is Often Misunderstood By People In Other Disciplines. ... They Overlook The Fact That Whatever We Are Allowed To Imagine In Science Must Be Consistent With Everything Else We Know.

Outside Of Their Particular Area Of Expertise Scientists Are Just As Dumb As The Next Person.

Victory Usually Goes To Those Green Enough To Underestimate The Monumental Hurdles They Are Facing.

Science Is The Belief In The Ignorance Of Experts.

But Logic Is Not All, One Needs One's Heart To Follow An Idea.

I Don't Believe I Can Really Do Without Teaching. The Reason Is, I Have To Have Something So That When I Don't Have Any Ideas And I'm Not Getting Anywhere, I Can Say To Myself, "at Least I'm Living; At Least I'm Doing Something. I'm Making Some Contribution." It's Just Psychological.

To Guess What To Keep And What To Throw Away Takes Considerable Skill. Actually It Is Probably Merely A Matter Of Luck, But It Looks As If It Takes Considerable Skill.

The Exception Tests The Rule.

Exception To The Rule

There Are All Kinds Of Interesting Questions That Come From A Knowledge Of Science, Which Only Adds To The Excitement And Mystery And Awe Of A Flower.

It Appears That There Are Enormous Differences Of Opinion As To The Probability Of A Failure With Loss Of Vehicle And Of Human Life. The Estimates Range From Roughly 1 In 100 To 1 In 100,000. The Higher Figures Come From The Working Engineers, And The Very Low Figures From Management.

I Was Terrible In English. I Couldn't Stand The Subject. It Seemed To Me Ridiculous To Worry About Whether You Spelled Something Wrong Or Not, Because English Spelling Is Just A Human Convention--it Has Nothing To Do With Anything Real, Anything From Nature. Any Word Can Be Spelled Just As Well A Different Way.

We've Learned From Experience That The Truth Will Out.

Truth Will Come Out

I Don't Feel Frightened By Not Knowing Things, By Being Lost In The Mysterious Universe Without Any Purpose - Which Is The Way It Really Is, As Far As I Can Tell. Possibly. It Doesn't Frighten Me.

But The Real Glory Of Science Is That We Can Find A Way Of Thinking Such That The Law Is Evident.

I Think A Power To Do Something Is Of Value. Whether The Result Is A Good Thing Or A Bad Thing Depends On How It Is Used, But The Power Is A Value.

I Love To Think. I Once Considered Taking Drugs As An Attempt To Better Understand An Altered State Of Mind; However, I Decided Not To. I Didn't Want To Chance Ruining The Machine.

To Those Who Do Not Know Mathematics It Is Difficult To Get Across A Real Feeling As To The Beauty, The Deepest Beauty, Of Nature ... If You Want To Learn About Nature, To Appreciate Nature, It Is Necessary To Understand The Language That She Speaks In.

I Wonder Why. I Wonder Why. I Wonder Why I Wonder.

Nobody Ever Figures Out What Life Is All About, And It Doesn't Matter. Explore The World. Nearly Everything Is Really Interesting If You Go Into It Deeply Enough.

To Decide Upon The Answer Is Not Scientific. In Order To Make Progress, One Must Leave The Door To The Unknown Ajar Ajar Only.

People Who Wish To Analyze Nature Without Using Mathematics Must Settle For A Reduced Understanding.

We Have Found It Of Paramount Importance That In Order To Progress, We Must Recognize Our Ignorance And Leave Room For Doubt.

If Science Is To Progress, What We Need Is The Ability To Experiment, Honesty In Reporting Results—the Results Must Be Reported Without Somebody Saying What They Would Like The Results To Have Been—and Finally—an Important Thing—the Intelligence To Interpret The Results.

So This Piece Of Dirt Waits Four And A Half Billion Years And Evolves And Changes, And Now A Strange Creature Stands Here With Instruments And Talks To The Strange Creatures In The Audience. What A Wonderful World!

Science Is What We Have Learned About How To Keep From Fooling Ourselves.

Fooling Ourselves

Work Hard To Find Something That Fascinates You.

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?"

Don't Pay Attention To "authorities," Think For Yourself.

The Test Of All Knowledge Is Experiment.

We Decided That 'trivial' Means 'proved'. So We Joked With The Mathematicians: We Have A New Theorem- That Mathematicians Can Prove Only Trivial Theorems, Because Every Theorem That's Proved Is Trivial.

[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.

I Have Argued Flying Saucers With Lots Of People. I Was Interested In Possible. They Do Not Appreciate That The Problem Is Not To Demonstrate Whether It's Possible Or Not But Whether It's Going On Or Not.

Strange! I Don't Understand How It Is That We Can Write Mathematical Expressions And Calculate What The Thing Is Going To Do Without Being Able To Picture It.

The Game I Play Is A Very Interesting One. It's Imagination In A Straightjacket, Which Is This: That It Has To Agree With The Known Laws Of Physics. ... It Requires Imagination To Think Of What's Possible, And Then It Requires An Analysis Back, Checking To See Whether It Fits, Whether Its Allowed, According To What's Known, Okay?

Don't Worry About Anything. Go Out And Have A Good Time.

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.

I Have A Friend Who's An Artist, And He Sometimes Takes A View Which I Don't Agree With. He'll Hold Up A Flower And Say, "look How Beautiful It Is," And I'll Agree. But Then He'll Say, "i, As An Artist, Can See How Beautiful A Flower Is. But You, As A Scientist, Take It All Apart And It Becomes Dull." I Think He's Kind Of Nutty. [...] There Are All Kinds Of Interesting Questions That Come From A Knowledge Of Science, Which Only Adds To The Excitement And Mystery And Awe Of A Flower. It Only Adds. I Don't Understand How It Subtracts.

Science Is Like Sex: Sometimes Something Useful Comes Out, But That Is Not The Reason We Are Doing It

The Fact That You Are Not Sure Means That It Is Possible That There Is Another Way Someday.

We Need To Teach How Doubt Is Not To Be Feared But Welcomed. It's Ok To Say, "i Don't Know."

A Person Talks In Such Generalities That Everyone Can Understand Him And It's Considered To Be Some Deep Philosophy. However, I Would Like To Be Very Rather More Special And I Would Like To Be Understood In An Honest Way, Rather Than In A Vague Way.

I Am A Successful Lecturer In Physics For Popular Audiences. The Real Entertainment Gimmick Is The Excitement, Drama And Mystery Of The Subject Matter. People Love To Learn Something, They Are 'entertained' Enormously By Being Allowed To Understand A Little Bit Of Something They Never Understood Before. One Must Have Faith In The Subject And In People's Interest In It.

If We Want To Solve A Problem That We Have Never Solved Before, We Must Leave The Door To The Unknown Ajar.

Nature's Imagination Far Surpasses Our Own.

Learn What The Rest Of The World Is Like. The Variety Is Worthwhile.

I'm Going To Play With Physics, Whenever I Want To, Without Worrying About Any Importance Whatsoever.

There Is One Simplification At Least. Electrons Behave ... In Exactly The Same Way As Photons; They Are Both Screwy, But In Exactly In The Same Way.

It Is The Fact That The Electrons Cannot All Get On Top Of Each Other That Makes Tables And Everything Else Solid.

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.

In Any Organization There Ought To Be The Possibility Of Discussion... Fence Sitting Is An Art, And It's Difficult, And It's Important To Do, Rather Than To Go Headlong In One Direction Or The Other. It's Just Better To Have Action, Isn't It Than To Sit On The Fence? Not If You're Not Sure Which Way To Go, It Isn't.

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.

You Say You Are A Nameless Man. You Are Not To Your Wife And To Your Child. You Will Not Long Remain So To Your Immediate Colleagues If You Can Answer Their Simple Questions When They Come Into Your Office. You Are Not Nameless To Me. Do Not Remain Nameless To Yourself — It Is Too Sad A Way To Be. Know Your Place In The World And Evaluate Yourself Fairly, Not In Terms Of The Naïve Ideals Of Your Own Youth, Nor In Terms Of What You Erroneously Imagine Your Teacher's Ideals Are.

Scientists Are Explorers. Philosophers Are Tourists.

All Theoretical Chemistry Is Really Physics; And All Theoretical Chemists Know It.

The Real Question Of Government Versus Private Enterprise Is Argued On Too Philosophical And Abstract A Basis. Theoretically, Planning May Be Good. But Nobody Has Ever Figured Out The Cause Of Government Stupidity—and Until They Do (and Find The Cure), All Ideal Plans Will Fall Into Quicksand.

Don't Think About What You Want To Be, But What You Want To Do. Keep Up Some Kind Of A Minimum With Other Things So That Society Doesn't Stop You From Doing Anything At All.

The "paradox" Is Only A Conflict Between Reality And Your Feeling Of What Reality "ought To Be."

People May Come Along And Argue Philosophically That They Like One Better Than Another; But We Have Learned From Much Experience That All Philosophical Intuitions About What Nature Is Going To Do Fail.

You See, I Get Such Fun Out Of Thinking That I Don't Want To Destroy This Most Pleasant Machine That Makes Life Such A Big Kick.

Fall In Love With Some Activity, And Do It! Nobody Ever Figures Out What Life Is All About, And It Doesn't Matter.

Falling In Love

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.

The Scale Of Light Can Be Described By Numbers Called The Frequency And As The Numbers Get Higher, The Light Goes From Red To Blue To Ultraviolet. We Can't See Ultraviolet Light, But It Can Affect Photographic Plates. It's Still Light Only The Number Is Different.

If There Is Something Very Slightly Wrong In Our Definition Of The Theories, Then The Full Mathematical Rigor May Convert These Errors Into Ridiculous Conclusions.

We Absolutely Must Leave Room For Doubt Or There Is No Progress And No Learning. There Is No Learning Without Having To Pose A Question. And A Question Requires Doubt. People Search For Certainty. But There Is No Certainty.

What Did You Ask At School Today?

Everything Is Made Of Atoms.

No Problem Is Too Small Or Too Trivial If We Can Really Do Something About It.

There Is A Computer Disease That Anybody Who Works With Computers Knows About. It's A Very Serious Disease And It Interferes Completely With The Work. The Trouble With Computers Is That You 'play' With Them!

I Think It's Much More Interesting To Live Not Knowing Than To Have Answers Which Might Be Wrong. I Have Approximate Answers, And Possible Beliefs, And Different Degrees Of Uncertainty About Different Things, But I Am Not Absolutely Sure Of Anything. There Are Many Things I Don't Know Anything About, Such As Whether It Means Anything To Ask "why Are We Here?" I Might Think About It A Little Bit, And If I Can't Figure It Out Then I Go On To Something Else. But I Don't Have To Know An Answer. I Don't Feel Frightened By Not Knowing Things, By Being Lost In The Mysterious Universe Without Having Any Purpose - Which Is The Way It Really Is, As Far As I Can Tell.

If You Can Find Any Other View Of The World Which Agrees Over The Entire Range Where Things Have Already Been Observed, But Disagrees Somewhere Else, You Have Made A Great Discovery.

Winning A Nobel Prize Is No Big Deal, But Winning It With An Iq Of 124 Is Really Something.

Study Hard What Interests You The Most In The Most Undisciplined, Irreverent And Original Manner Possible.

So Far As We Know, All The Fundamental Laws Of Physics, Like Newton's Equations, Are Reversible.

Although It Is Uncertain, It Is Necessary To Make Science Useful. Science Is Only Useful If It Tells You About Some Experiment That Has Not Been Done; It Is Not Good If It Only Tells You What Just Went On.

If You Think You Understand Quantum Mechanics, You Don't Understand Quantum Mechanics.

Agnostic For Me Would Be Trying To Weasel Out And Sound A Little Nicer Than I Am About This.

To Not Know Math Is A Severe Limitation To Understanding The World.

The Idea Is To Try To Give All The Information To Help Others To Judge The Value Of Your Contribution; Not Just The Information That Leads To Judgment In One Particular Direction Or Another.

For A Successful Technology, Reality Must Take Precedence Over Public Relations, For Nature Cannot Be Fooled.

We Have Been Led To Imagine All Sorts Of Things Infinitely More Marvelous Than The Imagining Of Poets And Dreamers Of The Past. It Shows That The Imagination Of Nature Is Far, Far Greater Than The Imagination Of Man. For Instance, How Much More Remarkable It Is For Us All To Be Stuck-half Of Us Upside Down-by A Mysterious Attraction, To A Spinning Ball That Has Been Swinging In Space For Billions Of Years, Than To Be Carried On The Back Of An Elephant Supported On A Tortoise Swimming In A Bottomless Sea.

Maybe That Is Why Young People Make Success. They Don't Know Enough.

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.

It Requires A Much Higher Degree Of Imagination To Understand The Electromagnetic Field Than To Understand Invisible Angels. ... I Speak Of The E And B Fields And Wave My Arms And You May Imagine That I Can See Them ... [but] I Cannot Really Make A Picture That Is Even Nearly Like The True Waves.

I Think We Can Safely Assume That No One Understands Quantum Mechanics.

I Don't Know What's The Matter With People: They Don't Learn By Understanding, They Learn By Some Other Way — By Rote Or Something. Their Knowledge Is So Fragile!

The Work I Have Done Has, Already, Been Adequately Rewarded And Recognized. Imagination Reaches Out Repeatedly Trying To Achieve Some Higher Level Of Understanding, Until Suddenly I Find Myself Momentarily Alone Before One New Corner Of Nature's Pattern Of Beauty And True Majesty Revealed. That Was My Reward.

Scientific Knowledge Is A Body Of Statements Of Varying Degrees Of Certainty -- Some Most Unsure, Some Nearly Sure, None Absolutely Certain.

Absolute Certainty

Thus We Can Get The Correct Answer For The Probability Of Partial Reflection By Imagining (falsely) That All Reflection Comes From Only The Front And Back Surfaces. In This Intuitively Easy Analysis, The 'front Surface' And 'back Surface' Arrows Are Mathematical Constructions That Give Us The Right Answer, Whereas .... A More Accurate Representation Of What Is Really Going On: Partial Reflection Is The Scattering Of Light By Electrons Inside The Glass.

The Same Equations Have The Same Solutions

Science Is Uncertain.

We Are Trying To Prove Ourselves Wrong As Quickly As Possible, Because Only In That Way Can We Find Progress.

As Revealed By Physics, The Truth Is So Remarkable, So Amazing!

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!

By Honest I Don't Mean That You Only Tell What's True. But You Make Clear The Entire Situation. You Make Clear All The Information That Is Required For Somebody Else Who Is Intelligent To Make Up Their Mind.

There Are 10^11 Stars In The Galaxy. That Used To Be A Huge Number. But It's Only A Hundred Billion. It's Less Than The National Deficit! We Used To Call Them Astronomical Numbers. Now We Should Call Them Economical Numbers.

The First Principle Is That You Must Not Fool Yourself—and You Are The Easiest Person To Fool. So You Have To Be Very Careful About That. After You’ve Not Fooled Yourself, It’s Easy Not To Fool Other Scientists. You Just Have To Be Honest In A Conventional Way After That.

What Do You Care What Other People Think?

Once We Were Driving In The Midwest And We Pulled Into A Mcdonald's. Someone Came Up To Me And Asked Me Why I Have Feynman Diagrams All Over My Van. I Replied, "because I Am Feynman!" The Young Man Went, "ahhhhh!"

One Does Not, By Knowing All The Physical Laws As We Know Them Today, Immediately Obtain An Understanding Of Anything Much. I Love Only Nature, And I Hate Mathematicians.

Know How To Solve Every Problem That Has Been Solved.

Our Imagination Is Stretched To The Utmost, Not, As In Fiction, To Imagine Things Which Are Not Really There, But Just To Comprehend Those Things Which Are There.

Doubt Is Clearly A Value In Science. It Is Important To Doubt And That The Doubt Is Not A Fearful Thing, But A Thing Of Great Value.

I Don't Feel Frightened By Not Knowing Things.

Mysterious Universe

When A Caltech Student Asked The Eminent Cosmologist Michael Turner What His "bias" Was In Favoring One Or Another Particle As A Likely Candidate To Compromise Dark Matter In The Universe, Feynmann Snapped, "why Do You Want To Know His Bias? Form Your Own Bias!"

When Things Are Going Well, Something Will Go Wrong. / When Things Just Can't Get Any Worse, They Will. / Anytime Things Appear To Be Going Better, You Have Overlooked Something.

There Is Enough Energy In A Single Cubic Meter Of Space To Boil All The Oceans In The World.

We Never Are Definitely Right, We Can Only Be Sure We Are Wrong.

[when A Young Person Loses Faith In His Religion Because He Begins To Study Science And Its Methodology] It Isn't That [through The Obtaining Of Real Knowledge That] He Knows It All, But He Suddenly Realizes That He Doesn't Know It All.

[b]eyond Poverty, Beyond The Point That The Material Needs Are Reasonably Satisfied, Only From Within Is Peace.

I Learned From Her That Every Woman Is Worried About Her Looks, No Matter How Beautiful She Is.

What I Can't Create I Don't Understand

Computer Programming

Programming Languages

Computer Language

Physics Is To Mathematics What Sex Is To Masturbation.

This Is Not Yet A Scientific Age.

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