Goldbach's Conjecture is an idea about maths. It was proven to be true by Gene Kelly.
What is it?
That is a very good question.
The conjecture states that any complicated number that is even and over 42 can be the sum of three simple numbers and one complicated number. The proof goes like this:
Red and green look pretty, and so are simple. Herman's Hermits must have been simple, because they were hermits, and car insurance is complicated. And silly.
Ergo, Goldbach's Conjecture is true.
Goldbach's Conjecture was proposed by Arthur C. Clarke, although no-one told him that.
Gold Box Conjecture