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NB: Not all of these are traditional "paradoxes", some are curiosities, some are resolvable.
This sentence is false.
A situation in which someone in need of something can only gain that thing if they do not need it.
There is a customer who, if they drink, everybody else in the pub drinks.
Observing a green apple confirms the hypothesis that all ravens are black.
A prisoner can prove that he cannot be hanged by surprise—so is surprised when he is then hanged.
Does a male barber who shaves all and only those men who don’t shave themselves, shave himself?
The phrase “The first number not nameable in under 10 words” names that number.
Does the set of all sets which do not contain themselves, contain itself?
A law student agrees to pay his teacher after he wins his first case. The teacher sues the student (who has not yet won a case) for payment.
Is the word heterological (meaning ‘not describing itself’) heterological?
‘Yields a falsehood when appended to its own quotation' yields a falsehood when appended to its own quotation.
I know that I know nothing at all.
If we replace any given part of a ship (or axe, broom, etc.), it remains the same ship. But if we have replaced all of the parts, over time, is it the same ship?
One grain of sand is not a heap. Adding a grain does not make it a heap. Then, no number of grains of sand is a heap.
There are as many square numbers as there are numbers.
If a hotel with infinitely many rooms is full, it can still take in more guests.
You can’t get from point A to point B as you would have to get half way to B, and halfway to halfway to B, etc.
How can we rationally choose between two options of equal value?
Pursuing happiness makes one miserable.
It is raining, but I don’t believe that it is.
Can God create a rock so heavy he cannot lift it?
An author believes that individually every sentence in his book is true, but that there is at least one error in the book.
The least number which does not have any interesting properties is interesting because it has that property.
If this sentence is true, then Santa Claus exists.
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