Maths in a minute

Why there are only three regular polygons you can tile a wall with.

Fermat's little theorem and fake primes.

Capturing symmetry with algebra.

Why the humble average can be grossly misleading.

How to write a sum that's infinitely long.

Euclid's fourth axiom says that all right angles are equal. But isn't that obvious?

Five basic facts from the father of geometry.