Philosophy

66 ideas, each explained on one page with a 60-second lesson you can play right there.

AI Alignment AI alignment steers artificial intelligence toward human goals rather than unintended shortcuts like reward hacking and strategic deception.
Anthropic principle The anthropic principle explains that we observe physical constants suitable for life because observers cannot exist in a universe without them.
Artificial consciousness Artificial consciousness is the idea that a non-biological machine or artificial intelligence could have subjective, inner experiences.
Artificial General Intelligence (AGI) Artificial general intelligence is hypothetical software that can learn, reason, and solve novel problems across any domain without reprogramming.
Authority bias Authority bias is the tendency to assume an opinion or order is accurate simply because it comes from an authority figure.
Benjamin Libet Benjamin Libet was an American neuroscientist who studied human consciousness at the University of California, San Francisco.
Block Universe The block universe theory treats time as a fourth dimension where past, present, and future events are all equally real and fixed.
Cato the Younger Cato the Younger was an influential, uncompromising Roman senator and Stoic philosopher during the fall of the Roman Republic.
Chinese Room John Searle's thought experiment showing that a computer running a program can mimic human conversation without understanding it.
Cold reading Cold reading uses high-probability guesses and subtle body language cues to make strangers reveal their own details while believing the reader knew them.
Compatibilism Compatibilism is the belief that free will and determinism can exist together without contradiction.
Copernican Principle The Copernican principle states that Earth occupies an average position in space and that humans are not privileged observers of the universe.
Determinism Determinism is the philosophical view that every event is the inevitable result of preceding events and the laws of nature.
Divination Divination is a ritual practice that seeks insight or answers by reading signs, omens, or random patterns.
Drake Equation The Drake equation is a mathematical formula that estimates how many active, communicative alien civilizations exist in our galaxy.
Dream interpretation Dream interpretation is the process of assigning meaning to the images and stories experienced during sleep.
Dreams A dream is a series of images, events, and emotions that your mind generates involuntarily while you sleep.
Epictetus Epictetus was a Greek Stoic philosopher who taught that suffering comes from trying to control external events rather than our own actions.
Eudaimonia Eudaimonia is an ancient Greek term for the highest human good, commonly understood as human flourishing or living well.
Fatalism Fatalism is the view that fate fixes every event, so no choice can change it.
Fermi Paradox The Fermi paradox exposes the clash between the high statistical odds of alien life across billions of stars and our complete lack of evidence for it.
Flow (psychology) Flow is a mental state where you become completely absorbed in an activity, losing track of time and outside distractions.
Freudian Unconscious The Freudian unconscious is the part of the mind holding hidden thoughts, drives, and memories that a person cannot inspect directly.
Friendship Friendship is a relationship of mutual affection between people that is stronger than an acquaintance or casual association.
Gaius Musonius Rufus Musonius Rufus was a 1st-century Roman Stoic who taught Epictetus, argued women need the same education as men, and was exiled by Nero.
Great Filter The Great Filter argues that an evolutionary barrier makes advanced life rare.
Hedonic treadmill Learn what the hedonic treadmill is, how psychological adaptation restores our happiness set point, and why big life events rarely change our mood forever.
Hedonism Hedonism is a family of philosophical ideas built on the claim that pleasure is the primary good and pain is the primary bad.
Horoscope A horoscope is an astronomical diagram mapping planetary positions at a specific moment, used since antiquity to interpret personality and events.
Id, ego and superego The id, ego, and superego are three interacting parts of the mind that Sigmund Freud proposed to explain internal conflict.
Ikigai Ikigai is a Japanese concept that refers to a person's reason for living or what makes life feel worth it.
Laplace's Demon Laplace's Demon is a thought experiment about a hypothetical intellect that knows the exact position and motion of every particle in existence.
Laziness Laziness is the emotional reluctance to act or exert effort even when you have the physical or mental capacity to do so.
Libertarianism (metaphysics) Metaphysical libertarianism is the view that we have free will, so determinism is false: you could have chosen otherwise.
Marcus Aurelius Marcus Aurelius was a Roman emperor and Stoic philosopher who governed the Roman Empire from 161 to 180 AD.
Meditations Marcus Aurelius wrote Meditations as a private journal of Stoic reflections while running the Roman Empire and leading military campaigns.
Milgram Experiment Stanley Milgram tested obedience to authority, finding 65% of participants willing to administer what they believed were fatal electric shocks.
MKUltra MKUltra was a covert, illegal human experimentation program run by the CIA from 1953 to 1972 to test mind control and truth serums.
Moravec's Paradox Moravec's paradox, set out by Hans Moravec in 1988: computers handle chess and calculus with ease but struggle with what a toddler does without thinking, like walking or recognizing a face.
Motivation Motivation is an internal state that drives people and animals to start, continue, or stop a specific behavior.
Narcissism Narcissism is a self-centered personality style marked by an excessive preoccupation with oneself and one's own needs, often at the expense of others.
Nostalgia Nostalgia is a bittersweet emotional longing for past events, people, or places that cannot be recovered.
Obedience Obedience is a form of social influence where a person follows direct orders from an authority figure.
Oedipus complex Sigmund Freud defined the Oedipus complex as childhood desire for one parent and rivalry with the other, shaping adult conscience and neurosis.
Panspermia Panspermia is the scientific hypothesis that microscopic life originated elsewhere and spreads across the universe inside rocks and comets.
Paradox of hedonism The paradox of hedonism is the observation that deliberately chasing pleasure often prevents you from experiencing it.
Philosophy Philosophy is the systematic study of fundamental questions about existence, knowledge, reason, mind, and values.
Platonic Relationship A platonic relationship is an affectionate, non-sexual bond originally conceived by Plato as an ascent toward absolute beauty.
Psychoanalysis Psychoanalysis is Freud's theory of mind and talk therapy for uncovering unconscious drives.
Psychological Manipulation Psychological manipulation is underhanded influence used for personal gain at another person's expense, exploiting vulnerabilities and biases.
Psychosexual development Sigmund Freud proposed that adult personality stems from how children resolve bodily conflicts across five distinct psychosexual stages.
Rare Earth hypothesis The Rare Earth hypothesis argues that simple life may be common, but complex, multicellular life requires an extremely rare set of circumstances.
Reinforcement Reinforcement is any consequence that increases the future rate of a behavior.
Schrödinger's Cat Schrödinger's cat is a thought experiment showing the paradox of quantum superposition, where a cat in a sealed box is both alive and dead.
Self-Control Self-control is the ability to regulate your thoughts, emotions, and behavior when facing immediate temptations and impulses.
Self-criticism Self-criticism is a personality trait where a person evaluates themselves negatively and blames their own character for failures.
Self-Worth Self-worth is an evaluation of your own value, abilities, and moral qualities, reflecting how you feel about who you are.
Seneca the Younger Seneca the Younger was an ancient Roman Stoic philosopher, statesman, and dramatist who served as the tutor and political advisor to Emperor Nero.
Sigmund Freud Sigmund Freud founded psychoanalysis, explaining how unconscious desires, dreams, and slips of the tongue shape human behavior.
Stoicism Stoicism is an ancient Greek and Roman philosophy that treats virtue and rational judgment as the highest goods in human life.
Subjective well-being Subjective well-being measures personal evaluations of life through emotional moods, life satisfaction, and meaning rather than external wealth.
Technological singularity The technological singularity is a hypothetical event where self-improving AI triggers rapid, runaway intelligence growth beyond human control.
The Ant and the Grasshopper Aesop's fable contrasts work and improvidence, evolving from a harsh ancient survival rule into debates on charity and art.
Turing Test Alan Turing replaced the question of machine thinking with a test: can a computer converse well enough through text to pass as human?
Usury Usury is the practice of lending money at interest rates that are unfairly high or exceed legal limits.
Zeno of Citium Zeno of Citium was a Hellenistic philosopher from Cyprus who founded the Stoic school of philosophy around 300 BC.