Why it's hard to build quantum computers and what can be done about it.

An untapped resource could provide the magic needed for quantum computation — and perhaps even open the door to time travel.

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.