105 philosophical questions worth arguing about

What makes an action right or wrong?

Why it's hard: Consequences, duties and character each give a different answer, and each handles some cases badly.

Is it ever right to harm one person to save five?

Why it's hard: In the trolley cases most people's verdict changes with how the harm is done, not only with the numbers.

Is there a moral difference between doing harm and allowing it?

Why it's hard: Many people treat pushing and failing to rescue differently, but it is hard to say why when the outcome is the same.

Are moral facts discovered, invented, or neither?

Why it's hard: Realists say moral claims can be true the way factual claims are; anti-realists explain them as attitudes, conventions or projections.

If moral views vary between cultures, does that make morality relative?

Why it's hard: Disagreement does not by itself show there is no fact of the matter, any more than disagreement in science does.

Does a good intention make up for a bad result?

Why it's hard: Judging people by what they meant and judging acts by what they caused can pull in opposite directions.

Can you be blamed for something that luck decided?

Why it's hard: Two equally careless drivers are judged very differently when only one of them hits a child: the problem of moral luck.

How much of your income do you owe to strangers in need?

Why it's hard: Peter Singer's drowning-child argument asks why distance should weaken a duty you would accept without hesitation nearby.

Do animals have rights, or only interests we should weigh?

Why it's hard: The answer decides whether animal suffering is traded against human benefit or treated as a limit on it.

Is lying always wrong, even to protect someone?

Why it's hard: Kant held that you may not lie even to a murderer asking where your friend is hiding, a conclusion few readers accept.

Can you owe anything to people who do not exist yet?

Why it's hard: Future people cannot claim anything now, yet present choices decide what their lives will be like.

Should you be more loyal to your family than to strangers?

Why it's hard: Impartial theories count everyone equally, while ordinary moral life treats close relationships as sources of real obligation.

Is being good mostly about what you do, or who you are?

Why it's hard: Virtue ethics moves attention from rules for acts to the character that produces them, and gives less direct advice under pressure.

Can something be legal and still wrong, or illegal and still right?

Why it's hard: If law and morality can come apart, something other than the law has to be the measure of right.

Would it be wrong to plug into a machine that guaranteed a happy life?

Why it's hard: Robert Nozick's experience machine asks whether anything matters to us besides how life feels from the inside.

Can a machine be conscious?

Why it's hard: Fluent behaviour may not settle whether anything is felt, which is why the question resists a simple test.

Why does any physical process feel like something from the inside?

Why it's hard: David Chalmers called this the hard problem: explaining what a brain does seems to leave open why it is experienced.

How do you know that anyone else has a mind?

Why it's hard: You observe other people's behaviour, never their experience, so the inference can never be checked directly.

Is the mind the same thing as the brain?

Why it's hard: Identity theorists say yes; dualists argue that mental states cannot be fully captured in physical terms.

Could there be a person physically identical to you with no inner experience at all?

Why it's hard: If such a philosophical zombie is even conceivable, some argue that consciousness cannot be purely physical.

Would a scientist who knew every physical fact about colour learn something new by seeing red?

Why it's hard: Frank Jackson's Mary's room case was built to test whether the physical facts are all the facts.

Could we ever know what it is like to be a bat?

Why it's hard: Thomas Nagel used the question to suggest that some facts about experience may be reachable only from the inside.

Does a program that follows rules for Chinese symbols understand Chinese?

Why it's hard: John Searle's Chinese room argues that manipulating symbols correctly is not the same as understanding them.

Are emotions judgements, feelings or bodily reactions?

Why it's hard: Each account fits some emotions well and struggles with others, such as moods that are not about anything.

Is your sense of choosing an accurate report or a story the brain tells afterwards?

Why it's hard: Experiments on the timing of decisions are often cited here, but what they show is heavily disputed.

Could you survive being uploaded into a computer?

Why it's hard: Even a perfect copy of your mind leaves open whether the copy is you or a new person who remembers your life.

Can you think without language?

Why it's hard: If thought needs words, infants and animals may not think as adults do; if it does not, language only dresses thoughts that come first.

Can you have a belief you are not aware of?

Why it's hard: If beliefs can be unconscious, then awareness is not what makes something a belief.

Is pain a feeling, or the behaviour that pain causes?

Why it's hard: Behaviourists tied mental states to behaviour; critics point to pain that is felt but hidden, or faked but not felt.

Would a perfect simulation of a brain be conscious, or only a model of one?

Why it's hard: A simulated storm is not wet; whether a simulated mind is different is exactly what is in dispute.

If every part of you is replaced over time, are you still the same person?

Why it's hard: The Ship of Theseus applies to people too: bodies renew and memories fade, yet something still seems to persist.

What makes you the same person you were at five years old?

Why it's hard: Memory, bodily continuity and a continuing psychology can each be proposed, and each can come apart from the others.

If your memories were moved into someone else's body, where would you be?

Why it's hard: John Locke's prince-and-cobbler case began the long argument that identity follows consciousness and memory rather than the body.

If you split into two people with your memories, which one would be you?

Why it's hard: Derek Parfit used fission cases to argue that identity may matter less than psychological continuity.

Is there a self behind your thoughts, or only the thoughts?

Why it's hard: David Hume reported that when he looked inward he found particular perceptions, never a self that had them.

Are you bound by promises a much younger you made?

Why it's hard: If people change enough, obligations taken on by an earlier self start to look like someone else's.

How much of who you are did you choose?

Why it's hard: Genes, upbringing and culture shape the very person who then does the choosing.

Would you still be you with a completely different personality?

Why it's hard: If your whole personality could change while you survive, it becomes unclear what the 'you' consists of.

Is there a real you, or only different selves for different settings?

Why it's hard: Work, family and friends bring out different people, and it is not obvious that one of them is the original.

Do you know yourself better than other people know you?

Why it's hard: You have direct access to your thoughts, yet others often predict your behaviour more accurately than you do.

Should someone be punished for what they did twenty years ago?

Why it's hard: If identity comes in degrees, responsibility may weaken as the connection to the earlier self weakens.

Would you take a pill that made you happier but changed your values?

Why it's hard: The person who wakes up satisfied may not be the person who agreed to take it.

Is your body something you are, or something you have?

Why it's hard: Everyday talk of 'my body' suggests ownership, while pain and illness suggest we simply are our bodies.

Does a person who loses most of their memories remain the same person?

Why it's hard: Memory-based theories of identity struggle with this case, and the answer matters to everyone who loves them.

If you could delete one memory, would you still be the person who lived through it?

Why it's hard: Removing a memory may also remove the lessons and relationships it made possible.

Why is there something rather than nothing?

Why it's hard: Leibniz posed it in these words; any answer seems either to assume something already exists or to need explaining itself.

Do we have free will if every event has a prior cause?

Why it's hard: Compatibilists say freedom survives determinism; libertarians and sceptics, for opposite reasons, say it cannot.

Is time travel logically possible?

Why it's hard: Changing the past threatens contradiction, while closed loops threaten to leave things with no origin.

Does time really pass, or does it only seem to?

Why it's hard: One family of views treats the present as special; another treats all times as equally real.

If you went back in time and prevented your own birth, what would happen?

Why it's hard: The grandfather paradox: success would remove the traveller, so the story cannot be told consistently.

Could something exist in a time loop without ever being made?

Why it's hard: The bootstrap paradox imagines a book that passes through time forever without anyone writing it.

Could a perfect being create a rock too heavy for itself to lift?

Why it's hard: The question tests whether 'all-powerful' can be defined without contradiction.

At exactly what point does a pile of sand become a heap?

Why it's hard: If one grain never makes the difference, the Sorites paradox concludes that no number of grains ever does.

Do numbers exist, and if so, where?

Why it's hard: Mathematics seems to state real truths, yet numbers have no location, mass or causal power.

Are colours in objects, or only in the minds that see them?

Why it's hard: Physics describes surfaces and wavelengths; the redness itself seems to belong to experience.

Does the past still exist?

Why it's hard: If only the present is real, it becomes hard to say what makes claims about the past true.

Could we be living in a computer simulation?

Why it's hard: Nick Bostrom's simulation argument says that, on certain assumptions, at least one of three surprising claims must be true.

If a tree falls in a forest and no one hears it, does it make a sound?

Why it's hard: The answer turns on whether 'sound' names a vibration in the air or an experience in a hearer.

Are there natural kinds, or only categories we impose?

Why it's hard: Whether 'species' or 'element' mark real divisions in nature is a live question in science as well as philosophy.

Do other possible worlds exist in any sense?

Why it's hard: Talk of what could have happened is indispensable in logic, but David Lewis's claim that other worlds are as real as ours strikes most people as incredible.

How do you know you are not a brain in a vat?

Why it's hard: If every experience would be the same either way, your evidence cannot settle the question.

How do you know you are not dreaming right now?

Why it's hard: René Descartes used the dream argument to ask which of his beliefs could survive doubt.

If you had only ever seen shadows, how would you recognise the real thing?

Why it's hard: Plato's cave asks how anyone can recognise a deeper reality when appearances are all they have known.

Is the sentence 'This sentence is false' true or false?

Why it's hard: The liar paradox shows that self-reference plus an ordinary truth predicate can generate a contradiction.

Is knowledge just a true belief you have good reason for?

Why it's hard: Edmund Gettier's 1963 cases describe justified true beliefs that turn out right only by luck.

Can you know anything for certain?

Why it's hard: Sceptics demand certainty and find little of it; their critics ask why knowledge should require certainty at all.

Does the sun rising every day so far prove it will rise tomorrow?

Why it's hard: David Hume's problem of induction: past regularity supports future expectation only if we already assume nature is uniform.

Is truth what matches reality, or what works?

Why it's hard: Correspondence and pragmatic theories agree on most cases and disagree about what truth is for.

Is it wrong to believe something without enough evidence?

Why it's hard: W. K. Clifford said always; William James replied that some choices are forced on us before the evidence arrives.

Can you trust your memory?

Why it's hard: Most of what you know depends on memory, and memory can only be checked against more memory.

Could you have a language that only you could understand?

Why it's hard: Wittgenstein's private language argument asks whether a word can mean anything without public rules for its use.

Is it rational to trust experts you cannot check?

Why it's hard: Almost everything you know about history, science and medicine rests on the word of people you have never met.

Can two people with the same evidence both be reasonable and still disagree?

Why it's hard: The debate over peer disagreement asks whether you should split the difference or hold your ground.

Is there a difference between seeing something and interpreting it?

Why it's hard: If perception already involves interpretation, there may be no neutral observation to settle a dispute.

Can a belief be useful and false at the same time?

Why it's hard: If comforting falsehoods help people flourish, truth and usefulness come apart, and it is unclear which should win.

What is the meaning of life?

Why it's hard: The question may ask for a purpose, a value or a story, and the answers change depending on which.

Does death give life its meaning?

Why it's hard: Limits create urgency, but they also cut projects short, and it is not obvious which effect wins.

Is love a choice or a feeling?

Why it's hard: If love is only a feeling, a promise to keep loving looks strange; if it is only a choice, it can look cold.

Can death be bad for the person who dies?

Why it's hard: Epicurus argued that where death is, we are not, so there is no one left for it to harm.

Why do we mind the time after our death but not the time before our birth?

Why it's hard: Lucretius argued that the time after death should mean no more to us than the time before we were born.

Would living forever be a gift or a burden?

Why it's hard: Bernard Williams argued that an endless life would eventually become tedious for anyone who stayed recognisably themselves.

Can a life be meaningful if no one remembers it?

Why it's hard: If meaning depends on impact, most lives fade; if it depends on how a life is lived, memory matters less.

If the universe has no purpose, can your life have one?

Why it's hard: Albert Camus called the clash between our demand for meaning and the world's silence 'the absurd'.

Is it better to be happy or to be good?

Why it's hard: Ancient ethics often refused to separate the two; ordinary experience suggests they can come apart.

Is a meaningful life different from a happy one?

Why it's hard: Many lives rich in meaning, such as years spent caring for a sick parent, are not especially pleasant.

Why do you love the people you love, and could anyone else replace them?

Why it's hard: If you love someone for their qualities, a person with the same qualities should do as well, which seems wrong.

Do children owe their parents anything for being born?

Why it's hard: No child consented to being born, which complicates the language of debt and gratitude.

Does grief show that a love is still going on?

Why it's hard: Grief can keep a relationship present even after any return of love has become impossible.

Do you choose what matters to you, or discover it?

Why it's hard: Existentialists stress choice; others hold that value is found in the world rather than made by us.

Would you want to know the date of your death?

Why it's hard: Knowing might focus a life or shadow it, and your answer says something about what you think time is for.

What would a fair society look like if you did not know your place in it?

Why it's hard: John Rawls's veil of ignorance asks you to choose principles before knowing whether you will be rich or poor, healthy or ill.

Why should anyone obey the law?

Why it's hard: Consent, fair play and gratitude have all been offered, and each struggles to explain why people who never agreed are bound.

Is it ever right to break the law in protest?

Why it's hard: Civil disobedience asks whether breaking a law openly and accepting the penalty can itself express respect for law.

How much freedom should you give up for safety?

Why it's hard: Most people accept some trade; the hard part is saying where it stops and who gets to decide.

Should free speech protect opinions most people find offensive?

Why it's hard: John Stuart Mill argued that silencing an opinion robs everyone of the chance to test their own views against it.

Should a tolerant society tolerate the intolerant?

Why it's hard: Karl Popper warned that unlimited tolerance can lead to the disappearance of tolerance, while still preferring argument to suppression where argument works.

Is inequality unjust in itself, or only when it harms the worst off?

Why it's hard: Rawls's difference principle allows inequalities only when they benefit the least advantaged.

Do you own everything you earn, or does society have a claim on part of it?

Why it's hard: Robert Nozick compared taxing earnings to forced labour; critics reply that markets depend on shared institutions.

Is democracy the best system of government, or only the least bad?

Why it's hard: Defenders appeal to equality and consent; critics point out that majorities can be uninformed or unjust.

Are you responsible for injustices that happened before you were born?

Why it's hard: Inheriting the benefits of a past wrong may create duties even where there is no personal guilt.

Should we judge historical figures by today's moral standards?

Why it's hard: If morality is not relative, past wrongs were wrong then too, but blame may depend on what people could have known.

Is punishment for deterrence, rehabilitation or deserved retribution?

Why it's hard: Each aim supports a different sentence for the same crime, so the choice is not academic.

Do nations have obligations to people outside their borders?

Why it's hard: Cosmopolitans say moral concern ignores borders; others think fellow citizens owe each other more.

Is privacy a right, or a preference we trade away?

Why it's hard: People say they value privacy highly and then give it away readily, which makes its value hard to pin down.

Should people be rewarded for talents they did nothing to earn?

Why it's hard: Natural talent is partly luck, yet rewarding effort alone would ignore what people actually achieve.