Decks
Written and checked by hand. Add any of them to your library and they’ll be mixed into your daily reviews.
Geography
US State Capitals
All 50 state capitals, from Montgomery to Cheyenne, each shown with the state on a map.
50 cards See the cardsUS States by Shape
Recognize every state from its outline alone, then see where it sits on the map.
50 cards See the cardsUS State Flags
Tell all 50 state flags apart, including the many blue ones with a seal in the middle.
50 cards See the cardsUS State Abbreviations
The two-letter postal codes, including the confusing M states: MA, MD, ME, MI, MN, MO, MS and MT.
50 cards See the cardsCountries of the World
Find all 194 countries on a globe. Each card highlights one, and you pick which it is.
194 cards See the cardsWorld Capitals
The capital of every UN member state and Vatican City, 194 in all.
194 cards See the cardsWorld Flags
Flags of all 194 countries. Wrong options come from the same continent, so Chad and Romania will meet.
194 cards See the cards
Space
The Solar System
The planets in order, their stranger moons, and what lies past Neptune.
49 cards See the cardsStars, Galaxies and the Universe
The stars you can find in the night sky, plus black holes, galaxies and how the universe began.
45 cards See the cards
Science
Elements and Their Symbols
All 118 elements of the periodic table from their symbols, lightest first.
118 cards See the cardsThe Human Body
Bones, organs, blood and the brain: the basic anatomy everyone should know about the body they live in.
41 cards See the cards
History
US Presidents in Order
Every president from Washington to the present, by number, with their years in office.
47 cards See the cardsAmendments to the US Constitution
All 27 amendments, from free speech to congressional pay. The best-known ones are tested in both directions.
36 cards See the cardsDates in World History
The dates that anchor a mental timeline, from the first Olympics to the 2008 financial crisis.
44 cards See the cards
Thinking and money
Personal Finance Basics
Compound interest, index funds, credit scores and taxes: the money knowledge school skipped.
32 cards See the cardsCognitive Biases
Twenty-six mental shortcuts that lead good thinkers astray, each with an everyday example.
26 cards See the cardsLogical Fallacies
Spot a straw man, a false dilemma or a post hoc argument from a single line of dialogue.
24 cards See the cards
Words
Words Worth Knowing
Precise words educated adults are expected to know, plus a few that most people use the wrong way.
38 cards See the cardsThe Greek Alphabet
All 24 Greek letters, capital and lower case, with where each turns up in science, maths and everyday English.
24 cards See the cards