How Many Words Are in the English Language?
There's no exact count. The OED has over 500,000 entries, Merriam-Webster's Unabridged over 476,000, and a 20-year-old native speaker knows about 42,000.
All guides
Friendly, fact-checked guides to word games, memory games and brain teasers.
Words & Spelling
Topic pageHow to Study for a Spelling Bee: Lists, Roots, Practice
Study the official 450-word school list, then the 4,000 Words of the Champions. Learn roots and origins, and practice asking the pronouncer questions.
What Is the Longest Word in English?
The longest word in major English dictionaries is the 45-letter pneumonoultramicroscopicsilicovolcanoconiosis. See how other famous long words compare.
Scripps National Spelling Bee Rules and How to Qualify
Who can enter the 2027 Scripps National Spelling Bee, how to qualify through school and regional bees, and how rounds, time limits and Spell-offs work.
Memory & Brain Training
Topic pageAverage Reaction Time: What's Normal?
Careful studies put simple visual reaction time at about 210 to 250 ms for adults. See how sound, choices, age and sleep change it, and how to test fairly.
Digit Span Test: How Many Numbers Can You Remember?
A digit span test has you repeat digits in order, then in reverse. Adults average about 6 to 7 forward and about 5 backward. Here's how to test yourself.
Do Brain Games Improve Memory? What Research Shows
Brain games mostly make you better at the games themselves. What the ACTIVE trial, scientists, the FTC and the NIA say, and which habits have better evidence.
What Is the N-Back Test? How It Works and What It Shows
The n-back test asks you to spot when an item matches the one from n steps back. How 1-, 2-, 3- and dual n-back work, and what training studies found.
Trivia & History
Topic pageFamous Historical Dates: What Year Did It Happen?
The Moon landing was July 20, 1969. Exact dates for 24 famous moments, from the Battle of Hastings to the first iPhone, plus the mix-ups people make.
Two-Player & Party Games
Topic pageHow to Win at Tic-Tac-Toe (and Never Lose)
Tic-tac-toe is always a draw with perfect play, so winning means never losing and punishing mistakes. Research-backed moves for X and O, plus a variant.