Why do we add fractions the way we do? A very close look at addition reveals the answer — and it also works for negative numbers.
John D. Barrow tells us how to get the best view!
How to derive the famous quadratic formula from pictures, just like the Babylonians did.
Given there's a finite number of notes on a scale, can we still find a brand new melody? Perhaps they've all been written already!
Five basic facts from the father of geometry.
Euclid's fourth axiom says that all right angles are equal. But isn't that obvious?