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Puzzles

Cleopatra the Demented

What's on the cards?

The Gobbling Goat

Put the gobbling goat on a diet

The Great Weights Puzzle

The great weights problem

Solution to Puzzle No. 6 world cup medallions

Can you collect the whole set?

Maths in a minute

Want facts and want them fast? Our Maths in a minute series explores key mathematical concepts in just a few words.

Citizen science: Schumann resonances

Resonant electromagnetic waves, created by lightning flashes, circle the Earth. Wim Hordijk explores the maths and shows how you can keep track with these phenomena.
The maths of randomness

Randomness is surprisingly hard to define. Fortunately the mathematical language we use to describe it is beautifully well defined.
Arithmetic billiards

Need to find the least common multiple or greatest common divisor of two numbers? A billiard table of the right proportions holds the answers!
The two envelopes problem solved

Here's a resolution for one of probability theory's most famous paradoxes.
The real numbers and Cauchy sequences

We take the real numbers for granted, but what are they really?

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