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Abilene Paradox
   states that   
A Group of People Often Has to Decide Against Each Member's Own Personal Interests or Views
Alabama Paradox
   states that   
Increasing the Total Number of Seats Might Shrink One Block's Seats
Allais Paradox
   states that   
A Change in a Possible Outcome Which is Shared by Different Alternatives Affects People's Choices Among Those Alternatives, in Contradition With Expected Utility Theory
Apportionment Paradox
   states that   
Some Systems of Apportioning Representation Can Have Unintuitive Results Due to Rounding
Archimedes Paradox
   states that   
A Massive Battleship Can Float in a Few Litres of Water
Arithmetic Paradoxes
   states that   
Proofs of Obvious Contradictions, for Example, Proving That 2=1 by Writing a Huge Expression and Dividing by Another Expression That is Zero
Arrow's Paradox
   states that   
You Can't Have All the Attributes of an Ideal Voting System at Once
Berkson's Paradox
   states that   
A Complicating Factor Arising in Statistical Tests of Proportions
Berry Paradox
   states that   
The Phrase the First Number Not Nameable in Under Ten Words Appears to Name It in Nine Words
Bertand's Paradox
   states that   
Different Common-sense Definitions of Randomness Give Quite Different Results
Birthday Paradox
   states that   
What is the Chance That Two People in a Room Have the Same Birthday?
50/50 in a room of 24
Black Hole Information Paradox
   states that   
Black Holes Violate a Commonly Assumed Tenet of Science - That Informtion Cannot Be Destroyed
Borel's Paradox
   states that   
Conditional Probability Density Functions Are Not Invariant Under Coordinate Transformations
Braess' Paradox
   states that   
Sometimes Adding Extra Capacity to a Network Can Reduce Overall Performance
Burali-Forti Paradox
   states that   
If the Ordinal Numbers Formet a Set, It Would Be an Ordinal Number Which is Smaller Than Itself
Carroll's Paradox
   states that   
The Angular Momentum of a Stick Should Be Zero, but is Not
Carroll's Paradox
   states that   
Whatever Logic is Good Enough Th Tell Me is Worth Writing Down...
Coastline Paradox
   states that   
The Perimeter of a Landmass is in General Ill-defined
Condorcet's Paradox
   states that   
A Group of Separately Rational Individuals May Have Preferences Which Are Irrational in the Aggregate
Control Paradox
   states that   
Man Can Never Be Free of Control, for to Be Free of Control is to Be Controlled by Oneself
Curry's Paradox
   states that   
If This Sentence is True, the World Will End in a Week
D'Alembert's Paradox
   states that   
An Inviscid Liquid Produces No Drag
Denny's Paradox
   states that   
Surface-dwelling Arthropods Should Not Be Able to Propel Themselves Horizontally
Diamond-water Paradox
   states that   
Neither Water nor Diamonds Are Rare, but Water is Cheaper Than Diamonds, Though Humans Need Water to Survive, Not Diamonds
Drinker Paradox
   states that   
In Any Pub There is a Customer Such That, if She or He Drinks, Everybody in the Pub Drinks
Edgeworth Paradox
   states that   
With Capacity Constraints, They May Not Be an Equilibrium
Ehrenfest Paradox
   states that   
On the Kinematics of a Rigid, Rotating Disk
Einstein-Podolsky-Rosen Paradox
   states that   
Can Far Away Events Influence Each Other in Quantum Mechanics
Elevator Paradox
   states that   
Elevators Can Seem to Be Mostly Going in One Direction, As if They Were Being Manufactured in the Middle of the Building and Being Disassembled on the Roof and Basement
Epicurean Paradox
   states that   
The Existence of Evil Seems to Be Incompatible With the Existence of an Omnipotent and Caring God
Epimenides Paradox
   states that   
A Cretan Says All Cretans Are Liars
Exception Paradox
   states that   
If There is an Exception to Every Rule, then Every Rule Must Have at Least One Exception, Excepting This One...is There an Exception to the Rule That States That There is an Exception to Every Rule?
Fermi Paradox
   states that   
If There Are, As Probability Would Suggest, Many Other Sentient Species in the Universe, then Where Are They?
Galileo's Paradox
   states that   
Though Most Numbers Are Not Squares, There Are No More Numbers Than Squares
Gibson's Paradox
   states that   
Why Were Interest Rates and Prices Correlated?
Giffen Paradox
   states that   
Increasing the Price of Bread Makes Poor People Eat More of It
Grandfather Paradox
   states that   
You Travel Back in Time and Kill Your Grandfather Before He Meets Your Grandmother Which Precludes Your Own Conception And, Therefore, You Couldn't Go Back in Time and Kill Your Grandfather
Grelling-Nelson Paradox
   states that   
Is the Word Heterological Meaning Not Applicable to Itself, a Heterological Word?
Hegel's Paradox
   states that   
Man Learns from History That Man Learns Nothing from History
Hilbert's Paradox of the Grand Hotel
   states that   
If a Hotel With Infinitely Many Rooms is Full, It Can Still Take More Guests
Hodgson's Paradox
   states that   
The Ratio of Two Gaussian Random Variables, Both With Equal Mean, Has Neither Mean nor Variance
Horse Paradox
   states that   
All Horses Are the Same Colour
Hutton's Paradox
   states that   
If Asking Oneself "Am I Dreaming" in a Dream Proves That One Is, What Does It Prove in Waking Life
Inspection Paradox
   states that   
Why You Will Wait Longer for That Bus Than You Should
Intentially Blank Page
   states that   
Many Documents Contain Pages on Which the Text "This Page in Intentionally Blank" is Printed, Thereby Making the Page Not Blank
Interesting Number Paradox
   states that   
The First Number That Can Be Considered "dull" Rather Than "interesting" Becomes Interesting Because of That Fact
Intransitive Dice
   states that   
You Can Have Three Dice, Called A, B, and C, Such That A is Likely to Win in a Roll Against B, B is Likely to Win in a Roll Against C, and C is Likely to Win in a Roll Against A
Irresistible Force Paradox
   states that   
Can an Irresistible Force Move an Immovable Object?
Irresistible Force Paradox
   states that   
What Would Happen if an Unstoppable Force Hits an Immovable Object?
Jevons Paradox
   states that   
Increases in Efficiency Lead to Even Larger Increases in Demand
Levinthal Paradox
   states that   
The Length of Time in Which a Protein Chain Finds Its Folded State is Many Orders of Magnitude Shorter Than It Would Be if It Freely Searched All Possible Configurations
Liar Paradox
   states that   
This Sentence is False
Liberal Paradox
   states that   
It is Impossible to Have Both a Commitment to Miminal Liberty and Pareto Optimality
Lindley's Paradox
   states that   
Tiny Errors in the Null Hypothesis Are Magnified when Large Data Sets Are Analyzed, Leading to False but Highly Statistically Significant Results
Lottery Paradox
   states that   
It is Philosophically Justifible to Believe That Every Individual Lottery Ticket Won't Win, but Not Justifiable to Believe That No Lottery Ticket Will Win
Low Birth Weight Paradox
   states that   
Low Birth Weight and Mothers Who Smoke Contribute to a Higher Mortality Rate. Babies of Smokers Have Lower Average Birth Weight, but Low Birth Weight Babies Born to Smokers Have a Lower Mortality Rate Than Other Low Birth Weight Babies
Mere Addition Paradox
   states that   
Does a Large Population Barely Living Tolerable Live Better Than a Small Happy Population?
Moore's Paradox
   states that   
It's Raining, but I Don't Believe That It is
Morton's Fork
   states that   
Choosing Between Unpalatable Alternatives
Mpemba Paradox
   states that   
Hot Water Can Under Certain Conditions Freeze Faster Than Cold Water, Even Though It Must Pass the Lower Temperature on the Way to Freezing
Necktie Paradox
   states that   
A Wager Between Two People Seems to Favour Them Both
Newcomb's Paradox
   states that   
A Paradoxial Gane Between Two Palyers, One of Whom Can Predict the Actions of the Other
New States Paradox
   states that   
Adding a New State or Voting Block Might Increase the Number of Votes of Another
Nihilist Paradox
   states that   
If Truth Does Not Exist, the Statement "truth Does Not Exist" is a Truth, Thereby Proving Itself Incorrect
Olber's Paradox
   states that   
Why is the Night Sky Black if There is an Infinity of Stars?
Omnipotence Paradox
   states that   
Can an Omnipotent Being Create a Rock Too Heavy to Lift?
Ontological Paradox
   states that   
Can a Time Traveller Send Himself Information With No Outside Source?
Paradox of the Court
   states that   
A Law Student Agrees to Pay His Teacher After Winning His First Case. The Teacher then Sues the Student (who Has Not Won a Case) for Payment
Paradox of Entailment
   states that   
Inconsistent Premises Always Make an Argument Valid
Paradox of Hedonism
   states that   
When One Pursues Happiness Itself, One is Miserable, But, when One Pursues Something Else, One Achieves Happiness
Parrondo's Paradox
   states that   
It is Possible to Play Two Losing Games Alternately to Eventually Win
Petronius' Paradox
   states that   
Moderation in All Things, Including Moderation
Population Paradox
   states that   
A Fast Growing State Can Lose Votes to a Slow Growing State
Quine's Paradox
   states that   
Yields a Falsehood when Appended to Its Own Quotation Yeilds a Falsehood when Appended to Its Own Quotation
Raven Paradox
   states that   
Observing a Red Apple Increases the Likelihood of All Ravens Being Black
Richard's Paradox
   states that   
We Appear to Be Able to Use Simple English to Define a Decimal Expansion in a Way Which is Self-contradictory
Russell's Paradox
   states that   
Does the Set of All Those Sets That Do Not Contain Themselves Contain Itself
SAR Paradox
   states that   
Exceptions to the Principle That a Small Change in a Moecule Causes a Small Change in Its Chemical Behavior Are Frequently Profound
Schrodinger's Cat Paradoc
   states that   
A Quantum Paradox - Is the Cat Alive or Dead Before We Look?
Ship of Theseus
   states that   
It Seems Like You Can Replace Any Component of a Ship, and It Will Still Be the Same Ship. So You Can Replace Them All, or One at a Time, and It Will Still Be the Same Ship. But then You Can Take All the Original Pieces, and Assemble Them Into a Ship. Tha
Smale's Paradox
   states that   
A Sphere Can, Topologically, Be Turned Inside out
Smallest Number Paradox
   states that   
Describes How a Rolling Object Should Be Able to Attain a Velocity of the Smallest Positive Number
Sorites Paradox
   states that   
One Grain of Sand is Not a Heap. If You Don't Have a Heap, then Adding Only One Grain of Sand Won't Give You a Heap. Then No Number of Grains of Sand Will Make a Heap. Similarly, One Hair Can't Make the Difference Between Being Bald and Not Being Bald. Bu
St. Petersburg Paradox
   states that   
People Will Only Offer a Modest Fee for a Reward of Infinite Value
Twin Paradox
   states that   
When the Travelling Twin Returns, He is Younger and Older Than His Sibling Who Stayed Put
Two-envelope Paradox
   states that   
You Are Given Two Indistinguishable Envelopes and You Are Told One Contains Twice As Much Money As the Other. You May Open One Envelope, Examine Its Contents, and Then, Without Opening the Other, Choose Which Envelope to Take
Unexpected Hanging Paradox
   states that   
The Day of the Hanging Will Be a Surprise, So It Cannot Happen at All, So It Will Be a Surprise
Zeno's Paradoxes
   states that   
You Will Never Reach Point B from Point A As You Must Always Get Half-way There, and Half of the Half, and Half of That Half, and So On...


Facts contributed by:


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