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.

Maths in a minute: Easy 11
Eleven makes multiplication easy.
Maths in a minute: Trisecting the angle
A quick look at an ancient problem.
Maths in a minute: Tiling troubles
Why there are only three regular polygons you can tile a wall with.
Maths in a minute: Pretend primes
Fermat's little theorem and fake primes.
Maths in a minute: The Navier-Stokes equations
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The mathematical problem with turbulence.
Maths in a minute: Local connectivity
How crinkly is crinkly?
Maths in a minute: Modular arithmetic
Count around the clock.
Maths in three minutes: Groups
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Capturing symmetry with algebra.
Maths in a minute: What's average?
Why the humble average can be grossly misleading.
Maths in a minute: Writing infinite sums
How to write a sum that's infinitely long.
Maths in a minute: Euclid's fourth axiom
Euclid's fourth axiom says that all right angles are equal. But isn't that obvious?
Maths in a minute: Euclid's axioms
Five basic facts from the father of geometry.