All lists

Latin phrases and abbreviations that show up in everyday English.

Common word roots that unlock the meaning of thousands of English words.

All 24 letters of the Greek alphabet with their names and Latin transliterations - the symbols behind math, science, and fraternities.

International Morse code for every letter and digit - dots and dashes for A–Z and 0–9.

The 26 code words used to spell letters unambiguously over radio and telephone - Alfa, Bravo, Charlie, and the rest.

The Roman numeral symbols and the subtractive forms - everything you need to read any numeral.

Every sovereign country and its capital city, grouped by continent - the backbone of world geography.

The ten longest rivers on Earth and the continents they cross.

The seven continents by area, population, and number of countries.

The five oceans of the world, by size and depth.

The highest mountain on each of the seven continents - the mountaineer's ultimate checklist.

All 50 United States with their capitals, postal abbreviations, and year of statehood.

A chronological tour of the conflicts that reshaped the world.

The rulers chronicled in Suetonius - from Julius Caesar to Domitian.

Every British Prime Minister from 1900 to today, with party and years.

The fifteen executive departments of the U.S. federal government.

All 27 amendments to the U.S. Constitution, what each one does, and the year it was ratified.

The eleven federal holidays in the United States - when they fall and when each became official.

Every President of the United States in order, with party and years in office - links out to each biography.

The first twenty chemical elements - the ones worth memorizing in order, with symbols and categories.

The twelve periods of the Phanerozoic eon, from the Cambrian to today.

The eleven organ systems that keep the human body running.

The SI prefixes from quetta to quecto, with symbols and powers of ten.

The ten reference minerals that rank scratch hardness from talc to diamond.

The eight planets in order from the Sun, with their type, moon count, and distance.

The seven base units of the International System of Units that every other unit is built from.

The major ranks of biological classification, from broadest to most specific, with the human example.

Group 18 of the periodic table - the famously unreactive elements.

Academy Award Best Picture winners from 2001 to the present.

The twelve animals of the Chinese zodiac, in order, with recent years and traits.

Western art from the Renaissance to Pop Art, with the artists who defined each era.

The seven winners of the 2007 global vote for the modern wonders.

The classical seven wonders, where they stood, and roughly when they were built.

The Greek goddesses who inspired the arts and sciences.

The principal gods of Greek mythology, their Roman counterparts, and what they ruled over.

The twelve astrological signs with their symbols, elements, and date ranges.

Every men's FIFA World Cup champion since the first tournament in 1930.

Every Super Bowl champion, from Super Bowl I to the most recent.