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The Pythagorean theorem in colourA right triangle with a square on each side. The areas of the blue and gold squares add up to the area of the red square.

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Playing cards and 52 factorial
ASTRONOMICALLY LARGE NUMBERS

Why no one has ever shuffled a deck of cards the same way twice

One ordinary deck. An extraordinary number of possibilities.

COMBINATORICS

How many combinations does a Rubik’s Cube have?

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Geometric Rubik’s Cube illustration

PROBABILITY

Why 23 people is enough for a shared birthday

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Twenty-three people with two sharing a birthday

MATHS IN NATURE

Why do honeybees build hexagons?

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Golden honeycomb tessellation

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