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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.

-Richard P. Feynman

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Everything We Know Is

Richard P. Feynman

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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.

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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.

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!

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.

Scientific Views End In Awe And Mystery, Lost At The Edge In Uncertainty, But They Appear To Be So Deep And So Impressive That The Theory That It Is All Arranged As A Stage For God To Watch Man's Struggle For Good And Evil Seems Inadequate.

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.

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

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

Everything Is Made Of Atoms.

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.

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.

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.

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.

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

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?

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

Nature Has A Great Simplicity And Therefore A Great Beauty.

You Do Not Know Anything Until You Have Practiced.

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.

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

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.

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

It Is In The Admission Of Ignorance And The Admission Of Uncertainty That There Is A Hope For The Continuous Motion Of Human Beings In Some Direction That Doesn't Get Confined, Permanently Blocked, As It Has So Many Times Before In Various Periods In The History Of Man.

Experiment Is The Sole Judge Of The Validity Of Any Idea.

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

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

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

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].

Science Is Of Value Because It Can Produce Something.

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

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

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

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

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

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

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.

Physicists Like To Think That All You Have To Do Is Say, These Are The Conditions, Now What Happens Next?

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

Scientific Knowledge Is An Enabling Power To Do Either Good Or Bad — But It Does Not Carry Instructions On How To Use It.

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!"

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

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?

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

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

Religion Is A Culture Of Faith; Science Is A Culture Of Doubt.

What Did You Ask At School Today?

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

What Do You Care What Other People Think?

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

Nature's Imagination Far Surpasses Our Own.

I'm Trying To Find Out Not How Nature Could Be, But How Nature Is.

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

No Man Is Rich Who Is Unsatisfied, But Who Wants Nothing Possess His Heart's Desire.

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.

Physics Is To Mathematics What Sex Is To Masturbation.

Science Is Uncertain.

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.

Nature...cannot Be Fooled!

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.

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

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

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

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.

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.

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.

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!"

(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

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.

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

[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.

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.

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

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.

Computer Science Is Not As Old As Physics; It Lags By A Couple Of Hundred Years. However, This Does Not Mean That There Is Significantly Less On The Computer Scientist's Plate Than On The Physicist's: Younger It May Be, But It Has Had A Far More Intense Upbringing!

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.

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

To Develop Working Ideas Efficiently, I Try To Fail As Fast As I Can.

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

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

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

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.

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

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.

Know How To Solve Every Problem That Has Been Solved.

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

Teach Principles Not Formulas.

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.

This Is Not Very Important What I'm Doing. I'm Just Proving Something.

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

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.

Physics Is Not The Most Important Thing. Love Is.

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.

Science Is The Organized Skepticism In The Reliability Of Expert Opinion

When A Scientist Doesn't Know The Answer To A Problem, He Is Ignorant. When He Has A Hunch As To What The Result Is, He Is Uncertain. And When He Is Pretty Darn Sure Of What The Result Is Going To Be, He Is Still In Some Doubt. We Have Found It Of Paramount Importance That In Order To Progress We Must Recognize Our Ignorance And Leave Room For Doubt. Scientific Knowledge Is A Body Of Statements Of Varying Degrees Of Certainty - Some Most Unsure, Some Nearly Sure, But None Absolutely Certain.

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.

This Is The Key Of Modern Science And Is The Beginning Of The True Understanding Of Nature. This Idea. That To Look At The Things, To Record The Details, And To Hope That In The Information Thus Obtained, May Lie A Clue To One Or Another Of A Possible Theoretical Interpretation.

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.

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

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

Fooling Ourselves

The Highest Forms Of Understanding We Can Achieve Are Laughter And Human Compassion.

The World Is A Dynamic Mess Of Jiggling Things

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

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.

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.

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

Scientists Are Explorers. Philosophers Are Tourists.

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.

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

If You Have Any Talent, Or Any Occupation That Delights You, Do It, And Do It To The Hilt. Don't Ask Why, Or What Difficulties You May Get Into.

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.

You Can Always Recognize Truth By Its Beauty And Simplicity.

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.

The Thing That Doesn't Fit Is The Thing That Is Most Interesting.

Most Interesting

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

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

Few People Realize The Number Of Things That Are Possible.

Today's Brains Are Yesterday's Mashed Potatoes.

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

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.

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.

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

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.

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.

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

Things You Like

It Is Necessary For The Very Existence Of Science That Minds Exist Which Do Not Allow That Nature Must Satisfy Some Preconceived Conditions.

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

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.

When It Came Time For Me To Give My Talk On The Subject, I Started Off By Drawing An Outline Of The Cat And Began To Name The Various Muscles. The Other Students In The Class Interrupt Me: "we *know* All That!" "oh," I Say, "you *do*? Then No *wonder* I Can Catch Up With You So Fast After You've Had Four Years Of Biology." They Had Wasted All Their Time Memorizing Stuff Like That, When It Could Be Looked Up In Fifteen Minutes.

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.

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

It Is Going To Be Necessary That Everything That Happens In A Finite Volume Of Space And Time Would Have To Be Analyzable With A Finite Number Of Logical Operations. The Present Theory Of Physics Is Not That Way, Apparently. It Allows Space To Go Down Into Infinitesimal Distances, Wavelengths To Get Infinitely Great, Terms To Be Summed In Infinite Order, And So Forth; And Therefore, If This Proposition [that Physics Is Computer-simulatable] Is Right, Physical Law Is Wrong.

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?"

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.

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

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.

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!

Our Poets Do Not Write About It; Our Artists Do Not Try To Portray This Remarkable Thing. I Don't Know Why. Is Nobody Inspired By Our Present Picture Of The Universe? The Value Of Science Remains Unsung By Singers... This Is Not Yet A Scientific Age.

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.

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

What Is Not Surrounded By Uncertainty Cannot Be The Truth.

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

No One Really Understands Quantum Mechanics.

Quantum Mechanics

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.

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.

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.

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.

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

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.

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.

Thank You Very Much, I Enjoyed Myself

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

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.

... 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.

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!

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.

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.

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.

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.

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.

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!

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

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?

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.

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

There Are Thousands Of Years In The Past, And There Is An Unknown Amount Of Time In The Future. There Are All Kinds Of Opportunities, And There Are All Kinds Of Dangers.

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 .

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.

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.

Ordinarily It Would Take Me About Fifteen Minutes To Get A Hallucination Going," Wrote Feynman, "but On A Few Occasions, When I Smoked Some Marijuana Beforehand, It Came Very Quickly.

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 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.

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

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.

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!

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.

Mathematics Is Not Just A Language. Mathematics Is A Language Plus Reasoning.

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

Progress In Science Comes When Experiments Contradict Theory.

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

I Don't Feel Frightened By Not Knowing Things.

Mysterious Universe

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

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.

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

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.

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.

The First Principle Is That You Must Not Fool Yourself And You Are The Easiest Person To Fool.

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

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

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

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.

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.

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.

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.

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.

What Is The Fundamental Hypothesis Of Science, The Fundamental Philosophy? We Stated It In The First Chapter: The Sole Test Of The Validity Of Any Idea Is Experiment. ... If We Are Told That The Same Experiment Will Always Produce The Same Result, That Is All Very Well, But If When We Try It, It Does Not, Then It Does Not. We Just Have To Take What We See, And Then Formulate All The Rest Of Our Ideas In Terms Of Our Actual Experience.

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?"

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

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

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