Fractal Art in Your Browser: Koch, Hilbert, Sierpinski
Replace, repeat, and a triangle grows an infinite coastline: the three classic fractals with their strange numbers, drawn live in twenty-plus browser tools.
Math Guides
Percentages, primes, sequences, statistics and the other math people actually meet, each guide built on worked numbers you can re-run in the free client-side calculators.
True Randomness: Coin Flips, Dice and RNG Fairness
Sixty heads in a hundred flips happens to fair coins routinely: what randomness actually looks like, and how to test fairness with arithmetic, not vibes.
Mean, Median, Mode: Read Data Like a Pro
The average is closer to a choice than a fact: 62.14, 40 and 35 all describe the same seven salaries, and the gaps between them are the diagnosis.
Fibonacci and Lucas: Sequences in the Wild
The famous sequence and its lesser-known sibling: the miles-to-km accident, the sunflower spirals that check out, and the nautilus that does not.
Prime Numbers: Tests, Factors and Why They Matter
From testing 97 in four checks to the 600-digit products guarding your browser: the practical prime questions, answered with worked numbers.
Percentages Without Panic: Increase, Decrease, Of
The most used and most fumbled math in adult life, with a short rule for every classic fumble and worked numbers throughout.