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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.

-Richard P. Feynman

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Richard P. Feynman

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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.

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Incomplete Knowledge

More From Richard P. Feynman

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

What We Need Is Imagination, But Imagination In A Terrible Strait-jacket.

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."

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

The Worthwhile Problems Are The Ones You Can Really Solve Or Help Solve, The Ones You Can Really Contribute Something To... No Problem Is Too Small Or Too Trivial If We Can Really Do Something About It.

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.

If You're Doing An Experiment, You Should Report Everything That You Think Might Make It Invalid - Not Only What You Think Is Right About It; Other Causes That Could Possibly Explain Your Results; And Things You Thought Of That You've Eliminated By Some Other Experiment, And How They Worked -to Make Sure The Other Fellow Can Tell They Have Been Eliminated.

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.

... 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.

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.

I Don't Like Honors. 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.

Energy Is A Very Subtle Concept. It Is Very, Very Difficult To Get Right.

When You're Thinking About Something That You Don't Understand, You Have A Terrible, Uncomfortable Feeling Called Confusion... Now, Is The Confusion's Because We're All Some Kind Of Apes That Are Kind Of Stupid Working Against This, Trying To Figure Out [how] To Put The Two Sticks Together To Reach The Banana And We Can't Quite Make It... So I Always Feel Stupid. Once In A While, Though, The Sticks Go Together On Me And I Reach The Banana.

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.

I Don't Like Honors. ... 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.

You Can Recognize Truth By Its Beauty And Simplicity. When You Get It Right, It Is Obvious That It Is Right -- At Least If You Have Any Experience -- Because Usually What Happens Is That More Comes Out Than Goes In.

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!"

As Usual, Nature's Imagination Far Surpasses Our Own, As We Have Seen From The Other Theories Which Are Subtle And Deep.

The Quantum Universe Has A Quotation From Me In Every Chapter - But It's A Damn Good Book Anyway.

I Learned A Lot Of Different Things From Different Schools. Mit Is A Very Good Place…. It Has Developed For Itself A Spirit, So That Every Member Of The Whole Place Thinks That It’s The Most Wonderful Place In The World—it’s The Center, Somehow, Of Scientific And Technological Development In The United States, If Not The World … And While You Don’t Get A Good Sense Of Proportion There, You Do Get An Excellent Sense Of Being With It And In It, And Having Motivation And Desire To Keep On

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

Know How To Solve Every Problem That Has Been Solved.

I Think I Can Safely Say That Nobody Understands Quantum Mechanics.

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.

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

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 .

What Is Not Surrounded By Uncertainty Cannot Be The Truth.

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!

We've Learned From Experience That The Truth Will Out. Other Experimenters Will Repeat Your Experiment And Find Out Whether You Were Wrong Or Right. Nature's Phenomena Will Agree Or They'll Disagree With Your Theory. And, Although You May Gain Some Temporary Fame And Excitement, You Will Not Gain A Good Reputation As A Scientist If You Haven't Tried To Be Very Careful In This Kind Of Work. And It's This Type Of Integrity, This Kind Of Care Not To Fool Yourself, That Is Missing To A Large Extent In Much Of The Research In Cargo Cult Science.

Science Is A Process For Learning About Nature In Which Competing Ideas About How The World Works Are Measured Against Observations.

The Real Problem In Speech Is Not Precise Language. The Problem Is Clear Language.

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

Fooling Ourselves

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

(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

A Scientist Is Never Certain. ... We Absolutely Must Leave Room For Doubt Or There Is No Progress And There Is No Learning.

You Should Not Fool The Laymen When You're Talking As A Scientist... . I'm Talking About A Specific, Extra Type Of Integrity That Is Not Lying, But Bending Over Backwards To Show How You're Maybe Wrong, [an Integrity] That You Ought To Have When Acting As A Scientist. And This Is Our Responsibility As Scientists, Certainly To Other Scientists, And I Think To Laymen.

What I Am Going To Tell You About Is What We Teach Our Physics Students In The Third Or Fourth Year Of Graduate School... It Is My Task To Convince You Not To Turn Away Because You Don't Understand It. You See My Physics Students Don't Understand It... That Is Because I Don't Understand It. Nobody Does.

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

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.

During The Middle Ages There Were All Kinds Of Crazy Ideas, Such As That A Piece Of Rhinoceros Horn Would Increase Potency. Then A Method Was Discovered For Separating The Ideas - Which Was To Try One To See If It Worked, And If It Didn't Work, To Eliminate It. This Method Became Organized, Of Course, Into Science.

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

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

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

You See, One Thing Is, I Can Live With Doubt And Uncertainty And Not Knowing. I Have Approximate Answers And Possible Beliefs And Different Degrees Of Certainty About Different Things... It Doesn't Frighten Me.

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

The Same Equations Have The Same Solutions

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!

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

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.

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.

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.

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.

It Is Our Responsibility As Scientists, Knowing The Great Progress Which Comes From A Satisfactory Philosophy Of Ignorance, The Great Progress Which Is The Fruit Of Freedom Of Thought, To Proclaim The Value Of This Freedom; To Teach How Doubt Is Not To Be Feared But Welcomed And Discussed; And To Demand This Freedom As Our Duty To All Coming Generations.

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.

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?

In Physics The Truth Is Rarely Perfectly Clear, And That Is Certainly Universally The Case In Human Affairs. Hence, What Is Not Surrounded By Uncertainty Cannot Be The Truth.

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.

In Its Efforts To Learn As Much As Possible About Nature, Modern Physics Has Found That Certain Things Can Never Be "known" With Certainty. Much Of Our Knowledge Must Always Remain Uncertain. The Most We Can Know Is In Terms Of Probabilities.

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.

It Is Not Unscientific To Make A Guess, Although Many People Who Are Not In Science Think It Is.

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

I Am Going To Tell You What Nature Behaves Like. If You Will Simply Admit That Maybe She Does Behave Like This, You Will Find Her A Delightful, Entrancing Thing. Do Not Keep Saying To Yourself, If You Can Possibly Avoid It, 'but How Can It Be Like That?' ...nobody Knows How It Can Be Like That.

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.

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

Work As Hard And As Much As You Want To On The Things You Like To Do The Best.

Things You Like

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

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

Poets Say Science Takes Away From The Beauty Of Stars-mere Globs Of Gas Atoms. Nothing Is "mere". I Too See The Stars On A Desert Night, And Feel Them. But Do I See Less Or More? ...what Is The Pattern, Or The Meaning, Or The Why? It Does Not Do Harm To The Mystery To Know A Little More About It. For Far More Marvelous Is The Truth Than Any Artists Of The Past Imagined It.

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.

Physics Is Like Sex: Sure, It May Give Some Practical Results, But That's Not Why We Do It.

There Is Nothing That Living Things Do That Cannot Be Understood From The Point Of View That They Are Made Of Atoms Acting According To The Laws Of Physics.

No One Really Understands Quantum Mechanics.

Quantum Mechanics

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

The Electron Is A Theory We Use; It Is So Useful In Understanding The Way Nature Works That We Can Almost Call It Real.

You Have No Responsibility To Live Up To What Other People Think You Ought To Accomplish. I Have No Responsibility To Be Like They Expect Me To Be. It's Their Mistake, Not My Failing.

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

I Would Rather Have Questions That Can't Be Answered Than Answers That Can't Be Questioned.

It Is Impossible, By The Way, When Picking One Example Of Anything, To Avoid Picking One Which Is Atypical In Some Sense.

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.

I Can Live With Doubt And Uncertainty And Not Knowing. I Think It Is Much More Interesting To Live Not Knowing Than To Have Answers That Might Be Wrong. If We Will Only Allow That, As We Progress, We Remain Unsure, We Will Leave Opportunities For Alternatives. We Will Not Become Enthusiastic For The Fact, The Knowledge, The Absolute Truth Of The Day, But Remain Always Uncertain … In Order To Make Progress, One Must Leave The Door To The Unknown Ajar.

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.

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

If All Of Mathematics Disappeared, Physics Would Be Set Back By Exactly One Week.

It Does Not Matter Who You Are, Or How Smart You Are, Or What Title You Have, Or How Many Of You There Are, And Certainly Not How Many Papers Your Side Has Published, If Your Prediction Is Wrong Then Your Hypothesis Is Wrong. Period.

I Love Only Nature, And I Hate Mathematicians.

A Very Great Deal More Truth Can Become Known Than Can Be Proven.

To Test Whether You Have Learned An Idea Or A Definition, Rephrase What You Just Learned Without Using The New Word.

Words Can Be Meaningless. If They Are Used In Such A Way That No Sharp Conclusions Can Be Drawn.

I Find That Teaching And The Students Keep Life Going, And I Would Never Accept Any Position In Which Somebody Has Invented A Happy Situation For Me Where I Don't Have To Teach. Never.

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.

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.

If You Can't Explain Something To A First Year Student, Then You Haven't Really Understood .

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

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!

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

In Those Days, In Far Rockaway, There Was A Youth Center For Jewish Kids At The Temple.... Somebody Nominated Me For President Of The Youth Center. The Elders Began Getting Nervous, Because I Was An Avowed Atheist By That Time.... I Thought Nature Itself Was So Interesting That I Didn't Want It Distorted Like That. And So I Gradually Came To Disbelieve The Whole Religion.

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?

The Truth Always Turns Out To Be Simpler Than You Thought.

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.

Mathematics Is A Language Plus Reasoning. It's Like A Language Plus Logic. Mathematics Is A Tool For Reasoning.

Everything We Know Is Only Some Kind Of Approximation, Because We Know That We Do Not Know All The Laws Yet. Therefore, Things Must Be Learned Only To Be Unlearned Again Or, More Likely, To Be Corrected.

I Have A Limited Intelligence And I've Used It In A Particular Direction.

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

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

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

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.

If A Guy Tells Me The Probability Of Failure Is 1 In 100,000, I Know He's Full Of Crap.

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.

If The Professors Of English Will Complain To Me That The Students Who Come To The Universities, After All Those Years Of Study, Still Cannot Spell 'friend,' I Say To Them That Something's The Matter With The Way You Spell Friend.

There's Plenty Of Room At The Bottom.

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.

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.

That Is The Logical Tight-rope On Which We Have To Walk If We Wish To Interpret Nature.

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.

Science Is The Organized Skepticism In The Reliability Of Expert Opinion

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.

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

When I Found Out That Santa Claus Wasn't Real, I Wasn't Upset; Rather, I Was Relieved That There Was A Much Simpler Phenomenon To Explain How So Many Children All Over The World Got Presents On The Same Night! The Story Had Been Getting Pretty Complicated -- It Was Getting Out Of Hand.

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

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

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

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

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!"

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

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.

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.

The Other Thing That Gives A Scientific Man The Creeps In The World Today Are The Methods Of Choosing Leaders - In Every Nation. Today, For Example, In The United States, The Two Political Parties Have Decided To Employ Public Relations Men, That Is, Advertising Men, Who Are Trained In The Necessary Methods Of Telling The Truth Or Lying In Order To Develop A Product.

Nature...cannot Be Fooled!

There Is No Harm In Doubt And Skepticism, For It Is Through These That New Discoveries Are Made.

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.

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 Wrong.

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

But See That The Imagination Of Nature Is Far, Far Greater Than The Imagination Of Man.

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

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.

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.

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.

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.

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.

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.

Just As A Poet Often Has License From The Rules Of Grammar And Pronunciation, We Should Like To Ask For 'physicists' License From The Rules Of Mathematics In Order To Express What We Wish To Say In As Simple A Manner As Possible.

Science Is A Way Of Trying Not To Fool Yourself.

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.

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.

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 Reason And You'd Just Spoil It To Know It.

'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.

We Have This Terrible Struggle To Try To Explain Things To People Who Have No Reason To Want To Know.

What I Can't Create I Don't Understand

Computer Programming

Programming Languages

Computer Language

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.

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

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

God Was Invented To Explain Mystery. God Is Always Invented To Explain Those Things That You Do Not Understand.

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!

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

You Can Know The Name Of A Bird In All The Languages Of The World, But When You're Finished, You'll Know Absolutely Nothing Whatever About The Bird... So Let's Look At The Bird And See What It's Doing -- That's What Counts.

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.

Everything Is Made Of Atoms.

Nature Does Not Care What We Call It, She Just Keeps On Doing It.

Science Is Uncertain.

If You Keep Proving Stuff That Others Have Done, Getting Confidence, Increasing The Complexities Of Your Solutions - For The Fun Of It - Then One Day You'll Turn Around And Discover That Nobody Actually Did That One! And That's The Way To Become A Computer Scientist.

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

Nature Uses Only The Longest Threads To Weave Her Patterns, So That Each Small Piece Of Her Fabric Reveals The Organization Of The Entire Tapestry.

If I Could Explain It To The Average Person, I Wouldn't Have Been Worth The Nobel Prize.

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

The Inside Of A Computer Is As Dumb As Hell But It Goes Like Mad!

Only Realistic Flight Schedules Should Be Proposed, Schedules That Have A Reasonable Chance Of Being Met. If In This Way The Government Would Not Support Them, Then So Be It. Nasa Owes It To The Citizens From Whom It Asks Support To Be Frank, Honest, And Informative.

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.

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.

We Cannot Define Anything Precisely. If We Attempt To, We Get Into The Paralysis Of Thought That Comes To Philosophers, Who Sit Opposite Each Other, One Saying To The Other, "you Don't Know What You Are Talking About!" The Second One Says, "what Do You Mean By Know? What Do You Mean By Talking? What Do You Mean By You?"

I Believe That A Scientist Looking At Nonscientific Problems Is Just As Dumb As The Next Guy.

If It Disagrees With Experiment, It's Wrong.

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.

This Is Not Yet A Scientific Age.

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.

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

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.

People Are Always Asking For The Latest Developments In The Unification Of This Theory With That Theory, And They Don't Give Us A Chance To Tell Them Anything About What We Know Pretty Well. They Always Want To Know The Things We Don't Know.

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.

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.

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

I Have To Keep Going To Find Out Ultimately What Is The Matter With It In The End.

Another Thing I Must Point Out Is That You Cannot Prove A Vague Theory Wrong.

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

If You Thought That Science Was Certain - Well, That Is Just An Error On Your Part.

For Far More Marvelous Is The Truth Than Any Artists Of The Past Imagined It. Why Do The Poets Of The Present Not Speak Of It? What Men Are Poets Who Can Speak Of Jupiter If He Were A Man, But If He Is An Immense Spinning Sphere Of Methane And Ammonia Must Be Silent?

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

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

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

While I Am Describing To You How Nature Works, You Won't Understand Why Nature Works That Way. But You See, Nobody Understands That.

Science Is A Way To Teach How Something Gets To Be Known, What Is Not Known, To What Extent Things Are Known (for Nothing Is Known Absolutely), How To Handle Doubt And Uncertainty, What The Rules Of Evidence Are, How To Think About Things So That Judgments Can Be Made, How To Distinguish Truth From Fraud, And From Show.

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

Absolute Certainty

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

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.

Why Make Yourself Miserable Saying Things Like, "why Do We Have Such Bad Luck? What Has God Done To Us? What Have We Done To Deserve This?" - All Of Which, If You Understand Reality And Take It Completely Into Your Heart, Are Irrelevant And Unsolvable. They Are Just Things That Nobody Can Know. Your Situation Is Just An Accident Of Life.

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

A Philosopher Once Said, 'it Is Necessary For The Very Existence Of Science That The Same Conditions Always Produce The Same Results.' Well, They Don't!

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

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

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Frederick Sanger

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