Continued fractions reveal the good, the bad and the beautiful side of numbers.

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

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

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

What will quantum computers be able to do that ordinary computers can't do?

A closer look at one of the simplest quantum algorithms.