Daily questions
One question or passage a day, with where it comes from. Open one to read it, or answer today's inside the app.
Politics: Does a nation's claim to territory rest on history, on the people living there now, or on whoever can hold it by force?
Mathematics: Does a probability describe an objective frequency in the world, or a rational degree of belief given the available evidence?
Physics: The Standard Model leaves out gravity and does not explain dark matter. Is a deeper theory waiting, or is the model just incomplete by design?
Psychology: Is a personality trait a fixed disposition, or mostly a label for patterns that shift with the situation and the stage of life someone is in?
Philosophy: You know your own mind from the inside. How do you know anyone, or anything, else has one at all?
Biology: Is every trait shaped by selection for its current use, or are many just side effects of other adaptations, with a story invented after the fact?
Politics: Outcome vs Opportunity
Mathematics: Cantor's Diagonal Argument
Physics: Maxwell's Demon
Psychology: Phineas Gage Reassessed
Philosophy: The Evil Demon
Biology: Kin Selection
Politics: In the long run we are all dead.
Mathematics: Mathematics is the art of giving the same name to different things.
Physics: I think I can safely say that nobody understands quantum mechanics.
Psychology: Ordinary people, simply doing their jobs, and without any particular hostility on their part, can become agents in a terrible destructive process.
Philosophy: What does not kill me makes me stronger.
Biology: Man still bears in his bodily frame the indelible stamp of his lowly origin.
Politics: Does trade between nations make war less likely by raising its cost, or does it just create new grounds for conflict?
Mathematics: Mathematicians reason about ten-dimensional spaces they can never picture. Is that reasoning still intuition, or formal manipulation wearing its name?
Physics: Statistical mechanics defines temperature for huge collections of particles. Does temperature mean anything for a single atom?
Psychology: Classic social psychology ran mostly on undergraduates in a lab. How much of the canon, obedience included, generalizes past that setting?
Philosophy: Do people who do not exist yet have claims on how we act now, on climate, debt, or resources?
Biology: Does consciousness arise from information being broadcast widely in the brain, or from how information is integrated into one unified state?
Politics: Checks and Balances
Mathematics: Goldbach's Conjecture
Physics: No Center, No Edge
Psychology: Attachment Styles
Philosophy: Achilles and the Tortoise
Biology: Neural Darwinism
Politics: That government is best which governs least.
Mathematics: Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.
Physics: It is more important to have beauty in one's equations than to have them fit experiment.
Psychology: I suppose it is tempting, if the only tool you have is a hammer, to treat everything as if it were a nail.
Philosophy: There is but one truly serious philosophical problem, and that is suicide.
Biology: Endless forms most beautiful and most wonderful have been, and are being, evolved.
Politics: Can any global institution bind a great power that refuses to be bound, or does international law only govern the willing?
Mathematics: The continuum hypothesis cannot be proved or disproved from standard set theory axioms. Does that make it false, meaningless, or simply open?
Physics: Dark energy is stretching the universe apart, but nobody knows what it is. Is it a property of space itself, or does gravity change at cosmic scale?
Psychology: Growth mindset training shows real but modest effects in large trials, far short of the original claims. Sound theory oversold, or mostly noise?
Philosophy: Should punishment exist to give wrongdoers what they deserve, or only to deter future harm and protect others?
Biology: A trait measured as fifty percent heritable in a population is not fifty percent fixed by genes in any one person. Why does that keep getting confused?
Politics: Natural vs Legal Rights
Mathematics: Kolmogorov's Axioms
Physics: Block Universe
Psychology: Split-Brain Interpreter
Philosophy: The Teleporter Problem
Biology: Homeostatic Feedback
Politics: The curious task of economics is to demonstrate to men how little they really know about what they imagine they can design.
Mathematics: The essence of mathematics lies in its freedom.
Physics: I would not call that one but rather the characteristic trait of quantum mechanics, the one that enforces its entire departure from classical lines of...
Psychology: Give me a dozen healthy infants... I'll guarantee to take any one at random and train him to become any type of specialist I might select.
Philosophy: Existence precedes essence.
Biology: We are survival machines, robot vehicles blindly programmed to preserve the selfish molecules known as genes.
Politics: If a state arms itself purely for defense, why does that same act make its neighbors feel less secure?
Mathematics: The four color theorem was proved partly by exhaustive computer case-checking. Does a proof no human can fully review still explain the result?
Physics: Are black hole singularities real infinities where physics breaks down, or a sign that general relativity just stops applying there?
Psychology: Twin studies put a large share of IQ variance on genes. What does that number mean for a trait also reshaped by schooling and nutrition?
Philosophy: Remove one grain from a heap of sand and it is still a heap. Repeat enough times: when did it stop being one?
Biology: Is aging the execution of a program selection favored, or the buildup of damage that selection simply never suppressed past reproductive age?
Politics: Median Voter Theorem
Mathematics: Euler's Polyhedron Formula
Physics: Laplace's Demon
Psychology: Multiple Memory Systems
Philosophy: The Butterfly Dream
Biology: Junk DNA Revised
Politics: The only purpose for which power can be rightfully exercised over any member of a civilised community, against his will, is to prevent harm to others.
Mathematics: Probability theory is nothing but common sense reduced to calculation.
Physics: Hypotheses non fingo: I frame no hypotheses.
Psychology: All the world is not, of course, a stage, but the crucial ways in which it isn't are not easy to specify.
Philosophy: Reason is, and ought only to be the slave of the passions.
Biology: In nature nothing exists alone.
Politics: Has nuclear deterrence made great-power war less likely, or has it only raised the cost of the one that eventually happens?
Mathematics: Should significance testing set a fixed threshold like p under 0.05, or should it report the full strength of the evidence instead?
Physics: Why is there far more matter than antimatter in the universe, when the known laws treat them almost, but not quite, symmetrically?
Psychology: Libet found brain activity that precedes a person's conscious decision to move. Does that rule out free will, or just relocate where it happens?
Philosophy: This sentence is false. If it is true, it is false; if it is false, it is true. Which is it?
Biology: Does selection act mainly on genes, on whole organisms, or sometimes on groups? Biologists who agree on the math still argue about the right description.
Politics: Rule of Law
Mathematics: Galois's Solvability Criterion
Physics: Higgs Mechanism
Psychology: Zone of Proximal Development
Philosophy: The Greatest Happiness
Biology: Hygiene Hypothesis
Politics: From each according to his ability, to each according to his needs.
Mathematics: Numbers are the free creation of the human mind.
Physics: It was almost as incredible as if you fired a 15-inch shell at a piece of tissue paper and it came back and hit you.
Psychology: When we are no longer able to change a situation, we are challenged to change ourselves.
Philosophy: Men are disturbed not by the things which happen, but by the opinions about the things.
Biology: Man knows at last that he is alone in the universe's unfeeling immensity, out of which he emerged only by chance.
Politics: Can a war ever be fought justly, or does the scale of modern weapons make the idea of a just war obsolete?
Mathematics: Non-standard analysis makes infinitesimals rigorous again. Does it explain anything the epsilon-delta account already covers, or just restate it?
Physics: If entropy only increases, why was it so low at the start of the universe? No known law requires a low-entropy beginning.
Psychology: Antidepressants beat placebo in trials, but the gap shrinks once unpublished negative trials are added back in. How much of the benefit is the drug?
Philosophy: When two cultures disagree on right and wrong, is one simply mistaken, or is there no fact to be mistaken about?
Biology: Most traits track thousands of small-effect variants plus environment. What does it even mean to call one gene 'the gene for' intelligence or height?
Politics: Consent of the Governed
Mathematics: Godel's Incompleteness Theorems
Physics: Entropy's Arrow
Psychology: Priming Failed to Replicate
Philosophy: Blank Slate Mind
Biology: Genetic Drift
Politics: Man is by nature a political animal.
Mathematics: A mathematician, like a painter or a poet, is a maker of patterns.
Physics: If your theory is found to be against the second law of thermodynamics I can give you no hope; there is nothing for it but to collapse in deepest...
Psychology: Nothing in life is as important as you think it is while you are thinking about it.
Philosophy: Act only according to that maxim whereby you can at the same time will that it should become a universal law.
Biology: The great tragedy of science is the slaying of a beautiful hypothesis by an ugly fact.
Politics: Does a balance of power between rival states prevent war, or does it only make the eventual war larger?
Mathematics: Are there infinitely many primes p where p plus 2 is also prime? Bounded gaps between consecutive primes are proved; the gap of exactly two is not.
Physics: Several constants of nature sit in a narrow range that allows atoms and stars to form. Does that need explaining, or only look special because we exist?
Psychology: Freud's theory explains almost any behavior after the fact; Popper called that a weakness, not a strength. Does explanation need to predict, too?
Philosophy: If a god is both all powerful and perfectly good, why does undeserved suffering exist?
Biology: Is an ecosystem a bounded, integrated system with its own properties, or a label drawn loosely over organisms and processes that barely cohere?
Politics: Two Theories of Punishment
Mathematics: Epsilon-Delta Rigor
Physics: Cosmic Inflation
Psychology: Stanford Prison Experiment Reassessed
Philosophy: The General Will
Biology: Ecosystem Engineers
Politics: The history of all hitherto existing society is the history of class struggles.
Mathematics: We must know. We will know.
Physics: What is it that breathes fire into the equations and makes a universe for them to describe?
Psychology: The real question is not whether machines think but whether men do.
Philosophy: The life of man, solitary, poor, nasty, brutish, and short.
Biology: Everything is connected to everything else.
Politics: Does sovereignty protect a government from outside interference even when it is committing atrocities against its own people?
Mathematics: Are the axioms of set theory discovered facts about a mathematical reality, or choices justified only by their useful consequences?
Physics: Is spacetime fundamental, or does it emerge from something more basic, like patterns of quantum entanglement?
Psychology: Rosenhan's pseudopatients got themselves diagnosed as insane just by lying about one symptom; does that still prove diagnosis is unreliable?
Philosophy: Why does information processing in the brain feel like anything at all, from the inside?
Biology: A virus copies itself, mutates, and evolves, but cannot metabolize or reproduce without hijacking a host cell. Alive, or a border case?
Politics: Rational Ignorance
Mathematics: Fundamental Theorem of Algebra
Physics: Equivalence Principle
Psychology: Power Posing Disavowed
Philosophy: Rehearsing Disaster
Biology: Neutral Theory
Politics: Man is born free, and everywhere he is in chains.
Mathematics: My work always tried to unite the true with the beautiful, and when I had to choose one or the other, I usually chose the beautiful.
Physics: Henceforth space by itself, and time by itself, are doomed to fade away into mere shadows, and only a kind of union of the two will preserve an...
Psychology: The curious paradox is that when I accept myself just as I am, then I can change.
Philosophy: The obstacle as material
Biology: A thing is right when it tends to preserve the integrity, stability, and beauty of the biotic community.
Politics: When a people claims the right to self-determination, who decides where one nation ends and another begins?
Mathematics: Once geometries without the parallel postulate were shown consistent, was Euclidean space one option among many, or still somehow privileged?
Physics: Quantum mechanics predicts superpositions, but every measurement returns one definite outcome. What actually happens at that instant?
Psychology: Should mental disorders be sorted into distinct categories, or is each one really a point on a continuous scale of a shared trait?
Philosophy: If every choice follows from prior causes, is any choice ever really free?
Biology: Does a mental function like language or fear live in a specific brain region, or emerge from a network that shifts with task and context?
Politics: The Veil of Ignorance
Mathematics: Euclid's Infinitude of Primes
Physics: Decoherence, Not Collapse
Psychology: Marshmallow Test
Philosophy: Shadows on the Wall
Biology: Hebbian Plasticity
Politics: It is not from the benevolence of the butcher, the brewer, or the baker that we expect our dinner, but from their regard to their own interest.
Mathematics: God made the integers, all else is the work of man.
Physics: What we observe is not nature itself, but nature exposed to our method of questioning.
Psychology: The unconscious is the true psychical reality.
Philosophy: I think, therefore I am.
Biology: It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material.
Politics: Is the international system inherently anarchic, or do norms and institutions genuinely constrain what states do?
Mathematics: Complex numbers were once called imaginary and treated as bookkeeping tricks. Do they describe something real, or just compute something useful?
Physics: Classical mechanics is fully deterministic, so why do weather forecasts and other chaotic systems become unpredictable within days?
Psychology: Can therapy help someone recover a genuinely buried memory of abuse, or does the search for one create a false memory instead?
Philosophy: Five people die unless you pull a lever that kills one instead. Is pulling it required, permitted, or wrong?
Biology: Interbreeding, ecological niche, and shared ancestry each draw the line between species differently. Is any one of them picking out something real?
Politics: Tyranny of the Majority
Mathematics: Non-Euclidean Geometry
Physics: Noether's Symmetry Link
Psychology: Cognitive Dissonance
Philosophy: The Fear of Death
Biology: Endosymbiotic Theory
Politics: The strong do what they can and the weak suffer what they must.
Mathematics: 317 is a prime, not because we think so, or because our minds are shaped in one way rather than another, but because it is so, because mathematical...
Physics: If I have seen further, it is by standing on the shoulders of giants.
Psychology: Habit is the enormous fly-wheel of society, its most precious conservative agent.
Philosophy: The unexamined life is not worth living.
Biology: Nothing in biology makes sense except in the light of evolution.
June 16, 2026
Philosophy: Happiness depends upon ourselves.
June 15, 2026
Philosophy: The good life
June 14, 2026
Philosophy: Is it possible to do something that is purely selfless?
June 13, 2026
Philosophy: No man ever steps in the same river twice.
June 12, 2026
Philosophy: Memento mori
June 11, 2026
Philosophy: Would a perfect copy of you, atom for atom, be you?
June 10, 2026
Philosophy: Liberty consists in doing what one desires, without harm to others.
June 9, 2026
Philosophy: The will to believe
June 8, 2026
Philosophy: Do you own your beliefs, or did you inherit them?
June 7, 2026
Philosophy: That which does not kill us makes us stronger.
June 6, 2026
Philosophy: The golden mean
June 5, 2026
Philosophy: If you could live the same life over endlessly, would you want to?
June 4, 2026
Philosophy: I think, therefore I am.
June 3, 2026
Philosophy: Amor fati
June 2, 2026
Philosophy: Is happiness something you feel, or something you do?
June 1, 2026
Philosophy: We are what we repeatedly do. Excellence, then, is not an act but a habit.
May 31, 2026
Philosophy: Know thyself
May 30, 2026
Philosophy: Do we discover moral truths, or do we invent them?
May 29, 2026
Philosophy: The life of man is solitary, poor, nasty, brutish, and short.
May 28, 2026
Philosophy: The veil of ignorance
May 27, 2026
Philosophy: Would you press a button for a stranger's benefit at a small cost to yourself?
May 26, 2026
Philosophy: Man is born free, and everywhere he is in chains.
May 25, 2026
Philosophy: The categorical imperative
May 24, 2026
Philosophy: Can an action be right if it springs from a bad motive?
May 23, 2026
Philosophy: The only thing I know is that I know nothing.
May 22, 2026
Philosophy: The cave
May 21, 2026
Philosophy: If a tree falls in a forest and no one hears it, does it make a sound?
May 20, 2026
Philosophy: He who has a why to live can bear almost any how.
May 19, 2026
Philosophy: The examined life
May 18, 2026
Philosophy: Is it better to be feared or to be loved?
May 17, 2026
Philosophy: You have power over your mind, not outside events. Realize this, and you will find strength.
