binary number

A brief introduction to bits and why they're not the same as 0s and 1s.

How do you write numbers as string of 0s and 1s?

In the game of Nim one player always has a winning strategy — it depends on an unusual way of adding numbers.

How does a computer understand the colours to be displayed on the monitor's screen? It's all about red, green and blue and numbers written in a special way.