What's stopping us from building useful quantum computers? And how long until we'll have them?

Here's a brief introduction to the possible future of computing.

Some neat number tricks using numbers read backwards.

Eleven makes multiplication easy.

The impossible becomes possible when you move into the third dimension.

A quick look at an ancient problem.

A mathematical "paradox" explains why more roads don't necessarily mean fewer traffic jams.

Why there are only three regular polygons you can tile a wall with.