## 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. From symmetry to Euclid's axioms, and from binary numbers to the prosecutor's fallacy, learn some maths without too much effort.

Why a positive test result doesn't necessarily mean you have the disease.

Here's the ancient proof that there are infinitely many prime numbers.

Why a DNA match doesn't necessarily prove your guilt.