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Chemical elements and their atomic numbers
Every element of the periodic table and the number of protons in its nucleus.
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Chemical elements and their symbols
Every chemical element of the periodic table with the symbol that stands for it.
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World capitals
Every country with an ISO 3166 code and its capital city.
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International dialling codes
Each sovereign state and the telephone code that reaches it.
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Countries and their internet domains
Sovereign states that have exactly one two-letter country-code domain, paired with that domain. States with several domains, or with none of their own, are left out.
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Famous athletes and their sports
Well-known sportspeople and the sport they are known for. Athletes who competed in two sports are left out.
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Famous films and their directors
Widely known films and who directed them. Films with two directors are left out.
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Famous paintings since 1800
Paintings made in 1800 or later and the artist who painted them.
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Operas, operettas and musicals
Works for the musical stage and the composer who wrote the music.
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Currency codes (ISO 4217)
Currencies in circulation today and their three-letter ISO 4217 code.
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Cities of the world and their countries
Well-known cities that are not the capital of a sovereign state, and the country they stand in. Sizes run from world metropolises down to regional cities of about a hundred thousand people, and coverage is uneven: half the deck sits in the United States, Germany, France and Italy.
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Famous paintings before 1800
Paintings made before 1800 and the artist who painted them.
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Rock albums and who made them
Studio albums of the rock canon, from the British invasion to the guitar bands of the 2000s, and the artist credited with each one.
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Mountains and their ranges
Well-known summits and the mountain range they belong to.
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Countries and continents
Which continent each country belongs to.
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Japanese kanji: fourth year of primary school
The kanji taught in the fourth year of Japanese primary school (the kyōiku list, 202 characters in the official programme); this deck holds 201 of them, one having been dropped in review. The front of the card is the character on its own. The back gives its main meanings, then its on readings in katakana and its kun readings in hiragana. In a kun reading the dot separates what the kanji itself writes from the okurigana that follows it: 高.い is read takai and written 高い. The order of the cards comes from the source data and cannot be checked from this file, so no ordering is claimed.
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Mandarin Chinese: 200 essential two-character words
The 200 most frequent two-character words of spoken Mandarin — pronouns, question words, everyday verbs — with pinyin and English meaning. Start here once you know the characters.
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Mandarin Chinese: 200 more everyday words
The next 200 two-character words by frequency, after the essential two hundred: feelings, work, travel, family and the small words that hold a conversation together. Pinyin and English meaning on the back.
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Mandarin Chinese: two-character words 401 to 600
The next two hundred two-character words of spoken Mandarin by frequency, picking up exactly where the first four hundred stop: study, money, weather, the body, the words that carry an opinion. Pinyin and English meaning on the back, at most three meanings per card so the answer stays short enough to recall.
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Mandarin Chinese: two-character words 601 to 800
Two hundred more two-character words by frequency, after the first six hundred. This is where a learner leaves the survival vocabulary behind: abstract nouns, verbs of thought and of decision, the connectives of an argument. Pinyin and English meaning on the back.
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Medium-length French sentences
French sentences of seven to twelve words, with their English translation. The step after the short sentences: subordinate clauses, negation, complements. Every card carries a whole sentence — nothing has to be guessed from outside the card.
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Medium-length German sentences
German sentences of seven to twelve words, with their English translation. The step after the short sentences: subordinate clauses, negation, complements. Every card carries a whole sentence — nothing has to be guessed from outside the card.
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Medium-length Spanish sentences
Sentences of seven to twelve words in the Spanish of Spain, with their English translation. The step after the short sentences: subordinate clauses, negation, complements. Every card carries a whole sentence — nothing has to be guessed from outside the card.
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Short French sentences
French sentences of three to six words, with their English translation. The shortest band in the catalogue: enough to start without drowning in syntax. Every card carries a whole sentence — nothing has to be guessed from outside the card.
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Short German sentences
German sentences of three to six words, with their English translation. The shortest band in the catalogue: enough to start without drowning in syntax. Every card carries a whole sentence — nothing has to be guessed from outside the card.
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Short Spanish sentences
Sentences of three to six words in the Spanish of Spain, with their English translation. The shortest band in the catalogue: enough to start without drowning in syntax. Every card carries a whole sentence — nothing has to be guessed from outside the card.
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Japanese kanji: third year of primary school
The kanji taught in the third year of Japanese primary school (the kyōiku list, 200 characters in the official programme). The front of the card is the character on its own. The back gives its main meanings, then its on readings in katakana and its kun readings in hiragana. In a kun reading the dot separates what the kanji itself writes from the okurigana that follows it: 高.い is read takai and written 高い. Cards are ordered by how often the character appears in Japanese newspapers, so the most useful ones come first.
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Portuguese nouns in everyday use
Everyday Portuguese nouns with their English meaning, taken from the English Wiktionary. Dictionary headwords only: no plurals, no inflected forms, and the commonest words first. The two norms are mixed and nothing labels them: European forms such as equipa and telemóvel sit beside Brazilian ones such as banheiro and terremoto. The back of a card is the short Wiktionary definition kept as written, so it can give one sense among several rather than the single commonest translation. Cards are asked in one direction only, Portuguese to English, because many of the English glosses are too general to be answered backwards.
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Spanish nouns in everyday use
Everyday Spanish nouns with their English meaning, taken from the English Wiktionary. Single-word dictionary headwords only: no plurals, no inflected forms. Each back is the Wiktionary definition copied word for word, British or American spelling as the entry had it. The order follows word frequency measured on the Tatoeba corpus, so the commonest words come first. Cards run from Spanish to English only.
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Earth, rocks and weather
Science exam questions on rocks and minerals, erosion, volcanoes and earthquakes, oceans and rivers, weather and climate, from the ARC Easy set.
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Highest point of every country
The summit that stands highest within each sovereign state.
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Italian nouns in everyday use
Everyday Italian nouns with their English meaning, taken from the English Wiktionary. Dictionary headwords only: no plurals, no inflected forms, and the commonest words first. Each answer is the first sense of that Wiktionary entry, shortened but never rewritten, so it is a dictionary sense and not always the whole everyday range of the word.
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Chess openings: closed games and Indian defences (ECO D–E)
Named variations of volumes D and E — Queen’s Gambit, Slav, Semi-Slav, Grünfeld, Nimzo-Indian, King’s Indian, Queen’s Indian and the Catalan. Each card gives the moves of the variation.
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Philosophy, religions and human sciences
Open questions on philosophy, world religions, logic, psychology and society.
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Battles and their wars
Well-known battles and the war they were part of.
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Moons of the Solar System
Each named natural satellite and the planet it orbits.
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Pop and soul albums and who made them
Studio albums of pop, soul and R&B — Motown, the eighties, and the singers who followed — and the artist credited with each one.
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Chess openings: flank openings (ECO A)
Named variations of volume A — English Opening, Réti, Bird, Dutch Defense, Benoni, Benko Gambit, the 1. d4 sidelines and the irregular first moves. Each card gives the moves that define the variation.
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Chess openings: open games (ECO C)
Named variations of volume C — the 1. e4 e5 openings (Ruy Lopez, Italian Game, Scotch, King’s Gambit, Petrov), the French Defense, and the sidelines that transpose into them. Each card gives the moves of the variation.
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Chess openings: semi-open games (ECO B)
Named variations of volume B — everything Black plays against 1. e4 except 1… e5: Sicilian, Caro-Kann, Pirc, Modern, Scandinavian, Alekhine. Each card gives the moves of the variation.
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Japanese kanji: second year of primary school
The kanji taught in the second year of Japanese primary school (the kyōiku list, 160 characters in the official programme). The front of the card is the character on its own. The back gives its main meanings, then its on readings in katakana and its kun readings in hiragana. In a kun reading the dot separates what the kanji itself writes from the okurigana that follows it: 高.い is read takai and written 高い. Cards are ordered by how often the character appears in Japanese newspapers, so the most useful ones come first.
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Rivers and where they flow
Major rivers and the sea, gulf, bay or estuary they flow into. Rivers that end in another river are left out.
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Major cities of the Americas
The largest cities of North and South America apart from the national capitals, and the country each one stands in.
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Ecology and ecosystems
Biomes and the abiotic world, population and community dynamics, energy flow through ecosystems, and conservation.
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Everyday Spanish sentences
One hundred and fifty short, complete sentences in the Spanish of Spain, with their English translation. Every card carries a whole sentence — nothing has to be guessed from outside the card, and the vocabulary is kept to the commonest words of both languages.
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French nouns: the first hundred and fifty
The hundred and fifty commonest French nouns, each with its English meaning and its pronunciation in the international phonetic alphabet. Inflected forms are excluded: every card carries a dictionary headword.
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German nouns and their gender
The hundred and fifty commonest German nouns, each shown with the definite article that carries its gender — der, die or das — and its English meaning. Nouns whose gender varies are left out.
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Mandarin Chinese: the 150 most frequent characters
The 150 single characters you meet most often in spoken Mandarin, each with its pinyin and its English meaning. Only characters that stand on their own as a word are included; characters with more than one reading are left out, so every card has exactly one right answer.
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Plant biology
Seedless and seed plants, the form and physiology of roots, stems and leaves, and how flowering plants reproduce.
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The digestive system
The alimentary canal organ by organ and the accessory organs that serve it, the layers of the gut wall, the enzymes and the chemical and mechanical digestion of each class of nutrient.
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The somatic nervous system and the senses
Sensory receptors and the special senses, the ascending pathways that carry their signals to the cortex, the descending motor pathways, and the reflex arcs that bypass both.
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Genetics: inheritance, DNA and gene expression
From Mendel's crosses to chromosomes, DNA replication, transcription and translation, and the control of gene expression.
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The appendicular skeleton (glossary A–R)
Alphabetical glossary of the appendicular skeleton: the bones of the limbs and of the girdles that anchor them, with their named landmarks and joints. The deck holds the first half of the chapter glossary, from "acetabulum" to "radius" — the entries filed after R, among them the scapula, the tibia, the ulna and the carpal bones, are not in this deck, even though earlier definitions refer to them.
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Major cities of Asia
Large cities of Asia outside the national capitals, as listed by Natural Earth, and the country each one stands in. China accounts for 77 of the 145 cards, so the same answer comes back often.
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Space and the solar system
Science exam questions on the Sun, the Moon, the planets, stars and galaxies, and on what telescopes and spacecraft have found there.
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Hip-hop and electronic albums and who made them
Studio albums of hip-hop and electronic music, from the golden age of rap to French house, and the artist credited with each one.
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Major cities of Europe
A selection of large European cities other than the national capitals, and the country each one stands in.
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Matter, forces and energy
Grade-school science exam questions on states of matter, atoms and elements, chemical change, forces and motion, heat, light, sound, electricity and magnetism, taken from the ARC question set. A few items reach into Earth science — the water cycle, the rotation of the Earth, the core and the geomagnetic field — where the question is still about matter, waves or energy.
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Animal endocrine and musculoskeletal systems
Glossary of the animal endocrine and musculoskeletal systems: hormone types, hormone receptors and the glands that release them, then skeletal systems, bone structure and growth, joints, body movements and the mechanism of muscle contraction. Each card gives a term and asks for its definition.
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Chess openings: the families
Every named opening family of the ECO classification, with the moves that define it — from 1. e4 to the King’s Indian Defense. The backbone before any variation makes sense.
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Anime and Manga Trivia
Studios, mangaka, series and characters, from the community-built Open Trivia Database. One question per card, answered in full.
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Film Trivia
Directors, casts, awards and famous scenes, from the community-built Open Trivia Database. One question per card, answered in full.
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Geography Trivia
Countries, capitals, rivers and borders, from the community-built Open Trivia Database. One question per card, answered in full.
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Music Trivia
Bands, albums, singles and instruments, from the community-built Open Trivia Database. One question per card, answered in full.
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Science and Nature Trivia
Astronomy, biology, chemistry and physics questions from the community-built Open Trivia Database. One question per card, answered in full.
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Countries with a single official language
Sovereign states that recognise exactly one official language nationwide, and which one it is.
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History Trivia — Medium
Wars, treaties, rulers and turning points, from the community-built Open Trivia Database. The medium tier of the database: facts that need to be learnt rather than guessed. One question per card, answered in full.
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Video Game Trivia — Easy
Studios, consoles, characters and release history, from the community-built Open Trivia Database. The easy tier of the database: facts a regular reader of the subject will recognise, meant to be worked through quickly. One question per card, answered in full.
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Musicians and where they are from
Bands and singers of the last seventy years and the country MusicBrainz records them as coming from.
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The lymphatic and immune system
Lymphatic vessels and organs, the barrier and innate defences, T and B cell responses, antibodies and the immune memory that vaccination relies on.
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The respiratory system
The airways from nose to alveolus, the mechanics of breathing and the pressures that drive it, gas exchange and transport, and how ventilation is controlled.
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Living things
Grade-school science questions about plants, animals, cells, heredity and ecosystems, taken from the ARC Easy set. Each card carries one question and the text of its correct answer; that answer is the original option text, so it is often a short phrase rather than a full sentence.
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Video Game Trivia — Medium
Studios, consoles, characters and release history, from the community-built Open Trivia Database. The medium tier of the database: facts that need to be learnt rather than guessed. One question per card, answered in full.
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Sports Trivia
Olympics, world cups, clubs and record holders, from the community-built Open Trivia Database. One question per card, answered in full.
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Animal nervous and sensory systems
Neurons, action potentials and synapses, the divisions of the nervous system, then the sensory systems: touch, taste, smell, hearing, balance and vision.
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Famous books and their authors
Widely known literary works published since 1500, and who wrote them.
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United States: state capitals
Each state of the United States and the city where its government sits — Albany for New York, Sacramento for California, and the forty-eight others.
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Living things — science exam questions
Questions from grade-school and middle-school science exams on plants, cells, heredity, adaptation and ecosystems, with a few on how an investigation is set up and read. Each card keeps only the correct answer, so difficulty is mixed: some are plain recall, others take a step of reasoning.
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Music Trivia — Medium
Bands, albums, singles and instruments, from the community-built Open Trivia Database. The medium tier of the database: facts that need to be learnt rather than guessed, and the bulk of what the source holds. One question per card, answered in full.
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Nervous system
Key-term glossary of the nervous system, taken word for word from OpenStax Anatomy and Physiology, first edition: neurons and nervous tissue, the anatomy of the brain and spinal cord, and the autonomic division. Each card carries a term on the front and the book’s own definition on the back.
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Osmoregulation, the kidney, immunity and animal reproduction
Osmotic balance, nitrogenous wastes and the anatomy of the kidney and its blood supply, which carry most of the deck, then innate and adaptive immunity, and the modes of animal reproduction with the cleavage patterns of the early embryo. Gastrulation, the germ layers and organogenesis are not covered.
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Video Game Trivia — Hard
Studios, consoles, characters and release history, from the community-built Open Trivia Database. The hard tier of the database: dates, names and details that reward a reader who already knows the ground. One question per card; the answer is whatever the database records — often a proper noun or a title, sometimes a bare number or a date.
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Evolution, speciation and phylogeny
Natural selection and genetic drift, how species split, and how phylogenetic trees record the history of life.
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Management, marketing and economics
Open-answer cards adapted from MMLU multiple-choice items: schools of management thought, organisational structure and decision making, strategy, marketing and retailing, public relations practice, and the basics of macro- and microeconomics.
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Viruses, bacteria and archaea
How viruses are built, classified and replicated, the diseases they cause, then prokaryotic structure and metabolism, biofilms and antibiotic resistance.
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Skeletal system and joints: bone, skull, trunk and limb joints
The vocabulary of the skeleton and its joints: how bone tissue is built, grows and repairs itself; the bones and openings of the skull and of the trunk; and the joints of the whole body — the joints of the limbs (shoulder, elbow, hip, knee, ankle) included, not only those of the skull and trunk. Terms are drawn from the end-of-chapter glossaries of chapters 6, 7 and 9, and this deck covers only the beginning of the alphabet: it runs from “acetabular labrum” to “remodeling”, so terms from s to z (sacrum, sternum, suture, synovial joint, vertebral column…) are absent.
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Nuclear and particle physics
Radioactivity, the modes of decay, half-life and binding energy, the medical uses of radiation, fission and fusion, then quarks, leptons and the four fundamental forces.
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The urinary system, fluid and acid-base balance
The kidney and the nephron, how urine is formed and concentrated, the endocrine control of blood pressure and volume, and the buffers that hold blood pH where it must stay.
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Development and inheritance
Fertilisation, the embryonic and fetal periods, the placenta and the fetal membranes, labour and the newborn, lactation, and the patterns by which traits are inherited.
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Cardiovascular system glossary, A to H
Glossary terms on blood, the heart and the blood vessels, in alphabetical order from “abdominal aorta” to “hemophilia”. This deck is the first alphabetical part of the glossary only: terms falling after the letter H — plasma, platelets, preload, systole, the venae cavae, the jugular and mesenteric vessels, the pulmonary and tricuspid valves, and the rest — are not in it.
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Products, pricing, distribution and promotion
The marketing concept, market segmentation and the product life cycle, branding and packaging, pricing strategies, then distribution channels, wholesaling, retailing and the promotional mix.
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Japanese kanji: first year of primary school
The kanji taught in the first year of Japanese primary school (the kyōiku list, 80 characters in the official programme). The front of the card is the character on its own. The back gives its main meanings, then its on readings in katakana and its kun readings in hiragana. In a kun reading the dot separates what the kanji itself writes from the okurigana that follows it: 高.い is read takai and written 高い. Cards are ordered by how often the character appears in Japanese newspapers, so the most useful ones come first.
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Cell structure and the plasma membrane
Prokaryotic and eukaryotic cells and every organelle in them, the cytoskeleton and cell junctions, then the membrane itself and the passive and active transport that crosses it.
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Learning, thinking and intelligence
Classical and operant conditioning, reinforcement schedules and observational learning, then concepts and problem solving, language acquisition, and the theories and measurement of intelligence.
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The reproductive system
The male and female reproductive anatomy, gametogenesis, the hormones of the ovarian and uterine cycles, and the structures of the breast and of the external genitalia.
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Gases, liquids and solids
Gas laws, kinetic molecular theory and effusion, then intermolecular forces, phase transitions and diagrams, and the lattice types of crystalline solids.
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Animal diversity and invertebrates
Alphabetical glossary of the terms OpenStax defines for animal body plans, symmetry, embryonic development and the invertebrate groups. Each card is one term and its definition; the deck is a lexicon in alphabetical order, not a survey phylum by phylum, and it covers only the terms the two chapter glossaries happen to define.
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Earth, rocks and weather — harder questions
The harder half of the same exams: questions on the rock cycle, erosion, the water cycle, weather systems and the history written in the ground.
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Matter, forces and energy — harder questions
The harder half of the same exams: questions on matter, chemical reactions, forces and energy that take a step of reasoning rather than a fact recalled.
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The neurological exam
What each part of the neurological exam tests and which structure it points to: mental status, the cranial nerves, sensory and motor function, reflexes, coordination and gait.
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Cartoon Trivia
Animated series, studios, voice actors and running gags, from the community-built Open Trivia Database. One question per card, answered in full.
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Emotion, motivation and personality
Drive, arousal and self-efficacy theories, hunger, sexual behaviour and the theories of emotion, then the psychodynamic, humanistic, trait and social-cognitive views of personality.
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The chemistry of life and biological macromolecules
Atoms, bonds and the properties of water, then the four classes of macromolecule — carbohydrates, lipids, proteins, nucleic acids — and the structures each one folds into.
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General Knowledge Trivia — Easy
Everyday facts, records and curiosities, from the community-built Open Trivia Database. The easy tier of the database: facts a regular reader of the subject will recognise, meant to be worked through quickly. One question per card, answered in full.
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Information systems and accounting
How firms manage information and the systems and security that support it, then accounting: the balance sheet, income statement, cash flow statement and the ratios read from them.
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The integumentary system: skin, hair and nails
The layers of the skin and the cells in each, the accessory structures — hair, nails, glands — what the skin does besides covering, and the burns, cancers and disorders that affect it.
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Electromagnetic waves and optics
Maxwell's prediction and the electromagnetic spectrum, then reflection, refraction, mirrors and lenses, the eye and optical instruments, and the interference, diffraction and polarisation of light.
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Muscular system
Key Terms from the muscular-system chapters of OpenStax Anatomy and Physiology: the structure and physiology of muscle tissue — fibres, fascicles, connective sheaths, contraction, energy metabolism, smooth and cardiac muscle — together with named skeletal muscles, the movement many of them produce, and the anatomical compartments they belong to. The source glossary is alphabetical and this deck carries the part of it that fitted the catalogue's per-deck cap: most entries fall between « abductor » and « flexor », the rest are scattered further down the alphabet. It is a slice of the chapter vocabulary, not a complete survey of the muscular system.
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Management and organisational structure
Planning, organising, leading and controlling, the levels and skills of management, leadership styles, then departmentalisation, authority, span of control and the informal organisation.
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Organic and nuclear chemistry
Hydrocarbons and the main functional groups, then nuclear structure and binding energy, the modes of radioactive decay, fission and fusion, and the biological effects of radiation.
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Cells and tissues
Key Terms glossary from the OpenStax chapters on the cell and on tissues. Three quarters of it is histology: the four tissue types, epithelia, connective tissues, cartilage, tissue membranes, glands and wound healing. The rest is a smaller set of cell-level terms on the cell membrane, cell junctions, DNA replication, gene expression, interphase and cell potency. Organelles are not covered.
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Photosynthesis and cell communication
The light-dependent reactions and the Calvin cycle, then how cells signal to one another: receptors, second messengers, signalling pathways and the responses they trigger.
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Psychology: schools of thought and research methods
What psychology studies and the traditions it grew from, then how it is done: hypotheses, observation, surveys, correlation, experiments, sampling, reliability and research ethics.
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Animal respiration and circulation
Glossary terms and their definitions on gas exchange and circulation in animals: airways and lung mechanics, lung volumes and spirometry, oxygen and carbon dioxide transport, blood vessels and blood components, and the chambers, valves and cycle of the mammalian heart. The deck holds 65 term-to-definition cards taken from the end-of-chapter glossaries of OpenStax Biology, first edition; it is a vocabulary deck, not a course, and does not cover the chapter text, figures or numerical exercises.
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Fluids, temperature, heat and thermodynamics
Density, pressure and buoyancy, Bernoulli's principle and viscosity, then temperature scales and the gas laws, heat capacity and heat transfer, and the laws of thermodynamics with entropy.
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The human body: organization and anatomical terms
The vocabulary anatomy starts from: levels of organization, the anatomical position and its directional terms, planes and sections, body cavities and their membranes, homeostasis and medical imaging.
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Cell division: mitosis, meiosis and cancer
The cell cycle and its checkpoints, mitosis phase by phase, binary fission, what goes wrong in cancer, and the two meiotic divisions that make sexual reproduction possible.
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Comics Trivia
Publishers, artists, secret identities and story arcs, from the community-built Open Trivia Database. One question per card, answered in full.
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The chemical level of the body
Atoms, bonds and reactions as physiology uses them: water and its properties, acids, bases and pH, and the four families of organic molecules the body is built from.
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Biotechnology and genomics
The tools of molecular biology — cloning, PCR, gel electrophoresis, sequencing — and what genome mapping, genomics and proteomics do with what they produce.
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Economic systems and the business environment
Factors of production, the main economic systems, supply and demand, market structures, the macroeconomic indicators and the fiscal and monetary levers that move them.
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Prehistory and archaeology
Open questions on human origins, stone tools, early agriculture and the first civilisations.
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Kinetics, equilibrium and acid-base chemistry
Reaction rates and rate laws, collision theory, mechanisms and catalysis, the equilibrium constant and Le Chatelier's principle, then acids, bases, buffers, titration and solubility products.
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Medicine, biology and nutrition
Open questions on clinical practice, anatomy, human physiology and genetics, cell biology, evolution and nutrition, drawn from the MMLU benchmark (Hendrycks et al., 2021), which gathers multiple-choice items of varied origin. Each card asks one question and answers it in full — no multiple-choice letters.
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Money, banking and financial management
The functions of money, the central bank and the institutions that hold deposits, then financial management: working capital, sources of short- and long-term funding, and the securities markets.
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Observing the sky, orbits and gravity
The celestial sphere and the constellations, the birth of astronomy from Ptolemy to Kepler and Newton, orbital motion, and the cycles of seasons, moon phases, tides and eclipses.
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Black holes, galaxies and cosmology
General relativity, curved spacetime and black holes, the Milky Way and other galaxies, quasars and dark matter, then the expanding universe, the Big Bang and the search for life elsewhere.
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Chordates and vertebrates
The chordate characteristics, the jawless and jawed fishes, amphibians, reptiles, birds and mammals, and the anatomical features that separate the groups.
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Circuits, magnetism and induction
Series and parallel circuits, Kirchhoff's rules and meters, magnetic fields and forces on moving charges, then Faraday's law, inductance, transformers and AC circuits.
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Electric charge, potential and current
Charge, conductors and Coulomb's law, electric fields and field lines, potential and capacitance, then current, resistance, Ohm's law and electric power.
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English irregular verbs
The thirty irregular verbs that show up most often, with their past simple and past participle.
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Psychological disorders
How disorder is defined and classified, then the anxiety, obsessive-compulsive, trauma, mood, schizophrenia, dissociative, personality and neurodevelopmental categories.
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Social psychology
Attribution and situational influence, attitudes and cognitive dissonance, conformity, obedience and groupthink, prejudice and discrimination, aggression, attraction and altruism.
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Metals, nonmetals and coordination chemistry
The representative metals, metalloids and nonmetals group by group, then the transition metals: their occurrence, coordination complexes, ligands, isomerism and crystal field theory.
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The human body
Grade-school science exam questions on the human organ systems — circulation, breathing, digestion, the nervous system, bones and muscles — and how they work together. A few cards reach into neighbouring science topics that the questions raise along the way: blood-type inheritance, vaccines and immunity, and how a study is designed.
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Work, stress and health
Industrial-organisational psychology, job analysis, selection and organisational culture, then stressors and appraisal, the general adaptation syndrome, coping and the psychology of health.
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Chemical bonding and molecular geometry
Ionic and covalent bonding, Lewis structures, formal charge and resonance, VSEPR geometry and polarity, then valence bond theory, hybridisation and molecular orbitals.
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Metabolism and nutrition
Catabolism and anabolism of carbohydrates, lipids and proteins, the metabolic states between meals, vitamins and minerals, and the regulation of body temperature.
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General Knowledge Trivia — Medium
Everyday facts, records and curiosities, from the community-built Open Trivia Database. The medium tier of the database: facts that need to be learnt rather than guessed, and the bulk of what the source holds. One question per card, answered in full.
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Human resources and employee motivation
Recruitment, selection, training, appraisal and compensation, labour relations and collective bargaining, then the classic theories of motivation and how work is designed around them.
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Operations management
Production processes and facility layout, inventory and supply chain management, just-in-time and MRP systems, quality control and the technologies used on the factory floor.
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States of consciousness
Circadian rhythms and sleep regulation, the sleep stages and dreaming, the sleep disorders, and the major classes of psychoactive drug with the states they produce.
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Statistics: sampling, description and probability
Populations and samples, the sampling designs and the biases that spoil them, levels of measurement, the graphical and numerical summaries of data, then the vocabulary of probability.
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History Trivia — Hard
Wars, treaties, rulers and turning points, from the community-built Open Trivia Database. The hard tier of the database: dates, names and details that reward a reader who already knows the ground. One question per card, answered in full: the multiple-choice distractors are dropped. The community wording is reproduced verbatim, minor typographic quirks included, because a source card is never rewritten here; an entry found to teach a wrong fact is removed instead.
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International law, politics and security
Open questions on public international law, legal theory, US government and foreign policy, and security studies — jurisdiction, sovereignty, recognition of States, the sources of international law, the UN Charter, and the theories and doctrines that shaped American policy through the Cold War and after. Much of the deck is straight recall of named cases, treaties, doctrines and events; a number of cards are anchored to a specific historical moment (the Cold War, the 1991 Gulf War, the Clinton and George W. Bush administrations, the 2008 financial crisis) and are worded as history, not as current affairs.
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Physics: measurement and motion
Units, models and orders of magnitude, then motion in one and two dimensions: displacement, velocity, acceleration, free fall, vectors and projectile motion.
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Animal Trivia
Species, habitats, anatomy and collective nouns, from the community-built Open Trivia Database. One question per card, answered in full.
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Business ethics and the global marketplace
Ethical decision-making and corporate social responsibility, then international trade: balance of payments, exchange rates, tariffs and the treaties and institutions that govern them.
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Protists and fungi
The diversity, life cycles and ecology of protists, then the fungi: their structure, their reproduction, the groups they fall into and the symbioses and diseases they take part in.
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Television Trivia — Medium
Series, networks, characters and catchphrases, from the community-built Open Trivia Database. The medium tier of the database: facts that need to be learnt rather than guessed, and the bulk of what the source holds. One question per card, answered in full.
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Lifespan development
Nature and nurture, Piaget's cognitive stages, Erikson's psychosocial stages, Kohlberg's moral reasoning, attachment and parenting styles, and development from prenatal life to old age.
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Relativity, quanta and the atom
Special relativity and its consequences, the photoelectric effect and wave-particle duality, the uncertainty principle, then atomic structure, spectra and lasers.
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The Sun and the stars
The Sun's structure, its activity cycle and the nuclear fusion that powers it, then stellar spectra and classification, masses and sizes, and how distances to the stars are measured.
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Sensation and perception
Thresholds and signal detection, the anatomy and mechanisms of vision, hearing, taste, smell and touch, then the Gestalt principles and depth cues that turn sensation into perception.
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Television Trivia — Easy
Series, networks, characters and catchphrases, from the community-built Open Trivia Database. The easy tier of the database: facts a regular reader of the subject will recognise, meant to be worked through quickly. One question per card, answered in full.
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The solar system: planets, moons and small bodies
Earth as a planet and the worlds around it — Venus, Mars, the giant planets, rings and moons — then craters and impacts, comets, asteroids, meteorites and the origin of the system.
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Atoms, molecules, ions and composition
Atomic theory and chemical symbols, the periodic table and the families that divide it, ionic and covalent compounds and the rules used to name them, then chemical formulas, formula and molar mass, and the units that express the concentration of a solution.
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Work, energy, momentum and rotation
Work, kinetic and potential energy, power and conservation, then impulse and collisions, statics and torque, and the rotational quantities that mirror the linear ones.
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Animal form, function and nutrition
Body plans, symmetry, tissue types, cartilage and bone, thermoregulation and the vocabulary of homeostasis in animals, then digestive organs, digestive enzymes, diet types and two gut hormones that regulate acid secretion and the rate of gastric emptying.
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Astronomy and geography
Open questions on the solar system, stars and galaxies, and on the physical and human geography of the world: population and fertility, language families, religions, political geography, urban models and agriculture. Every card states a verifiable fact; no opinion, no calculation, no dated statistic.
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Electronic structure and periodic properties
Electromagnetic radiation and quantum theory, orbitals and quantum numbers, electron configurations, and the periodic trends in size, ionisation energy and electron affinity.
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Film Trivia — Medium
Directors, casts, awards and famous scenes, from the community-built Open Trivia Database. The medium tier of the database: facts that need to be learnt rather than guessed, and the bulk of what the source holds. One question per card, answered in full.
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Mathematics Trivia
Numbers, shapes, theorems and notation, from the community-built Open Trivia Database. One question per card, answered in full.
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Memory
Encoding, storage and retrieval, the sensory, short-term and long-term stores, the brain structures involved, the forms of amnesia, forgetting and memory distortion.
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Music Trivia — Easy
Bands, albums, singles and instruments, from the community-built Open Trivia Database. The easy tier of the database: facts a regular reader of the subject will recognise, meant to be worked through quickly. One question per card, answered in full.
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Stoichiometry of chemical reactions
Writing and balancing chemical equations, reaction stoichiometry, limiting reactants and percent yield, then the precipitation, acid-base and oxidation-reduction classes of reaction.
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Biopsychology: brain, neurons and genes
Genetics and behaviour, neuron structure and neurotransmitters, the divisions of the nervous system, the parts of the brain and what each does, and the endocrine system.
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Chemistry: essential ideas
What chemistry measures and how: states and properties of matter, the scientific method, SI units and derived units, significant figures, accuracy and precision.
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History Trivia — Easy
Forty-one history questions from the community-built Open Trivia Database, easy tier. What the pack covers follows what contributors happened to submit, not a syllabus: it leans hard on modern Western and military history — the two world wars, twentieth-century leaders, revolutions and independences — with a thinner scattering of antiquity, the Byzantine and Ottoman empires, and nineteenth-century Britain and America. Answers are dates, places and proper names. One question per card, answered in full: the multiple-choice distractors of the original are dropped.
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Oscillations, waves and sound
Simple harmonic motion, pendulums, resonance and damping, then the physics of sound: intensity and decibels, the Doppler effect, standing waves, beats and hearing.
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Forces, Newton's laws and circular motion
The three laws of motion and the four fundamental forces, friction, drag and elasticity, then uniform circular motion, centripetal force and Newton's law of gravitation.
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Harder science questions
Grade-school science exam questions from the harder, reasoning-heavy half of the ARC set: each one takes a step of reasoning rather than a fact you either know or do not. Physics, chemistry, biology, Earth and space science. Each card asks one question and answers it in full — no multiple-choice letters, no figure or table to look at, and no card resting on a date, a quantity or a number.
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The study of life: method and classification
What makes something alive, how biology is organised into its branches, the scientific method as biologists practise it, and the levels from atom to biosphere.
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Metabolism and cellular respiration
Energy, enzymes and the laws of thermodynamics as cells obey them, then glycolysis, the citric acid cycle, oxidative phosphorylation and the fermentation routes that do without oxygen.
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Therapy and treatment
The history of treatment and deinstitutionalisation, the psychotherapeutic orientations, the drug classes used in psychiatry, group and family formats, and how treatment effectiveness is judged.
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Light, spectra and telescopes
The electromagnetic spectrum, blackbody radiation, spectral lines and the Doppler effect, then the telescopes and detectors that collect light from radio waves to gamma rays.
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Electrochemistry
Balancing redox reactions, galvanic and electrolytic cells, standard electrode potentials, the Nernst equation, batteries, fuel cells and corrosion.
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Grade-school science questions
Thirty-three science questions from real grade-school exams, taken from the ARC Easy set. Each card asks one question and gives the correct answer in words, with no option letters and no answer grid. Some questions open with a short scenario; the answer is always the one the exam marked correct, kept word for word.
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Interstellar matter, star birth and star death
The gas and dust between the stars, how stars form and how exoplanets were found, the main sequence and what follows it, then white dwarfs, supernovae, neutron stars and pulsars.
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Thermochemistry and thermodynamics
Heat, work, enthalpy and calorimetry, then entropy, the second and third laws, Gibbs free energy and what makes a process spontaneous.
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Forms of business ownership and entrepreneurship
Sole proprietorships, partnerships, corporations and cooperatives with the liability each carries, mergers and acquisitions, franchising, and what starting a small business involves.
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Solutions and colloids
The dissolution process and solubility, electrolytes, the colligative properties — vapour pressure, boiling point, freezing point, osmosis — and the behaviour of colloids.