Want facts and want them fast? Our *Maths in a minute* series explores key mathematical concepts in just a few words. From symmetry to Euclid's axioms, and from binary numbers to the prosecutor's fallacy, learn some maths without too much effort.

Maths in a minute: The exponential distribution

How long do you have to wait for something to happen?

Maths in a Minute: Turbulence and the Reynolds number

How does a smooth flow suddenly become turbulent? The Reynolds number helps understand the transition.

Maths in a Minute: Fluid dynamics and the Euler equations

How does water, or indeed any fluid, move? The Euler equations let us look beneath the surface and mark the beginning of modern fluid dynamics.

Maths in a Minute: Category theory

A quick introduction to an abstract concept that's useful in anything from genetics to cosmology.

Maths in a Minute: The wagon wheel effect

Have you ever noticed the strange phenomenon of wheels appearing to move backwards while the vehicle is moving forwards? Aadit Jain explains why!

Maths in a minute: Semi-supervised machine learning

Machine learning started with supervised learning and us providing all the training materials, but we are finding ways for algorithms to learn with far fewer resources.