A closer look at one of the simplest quantum algorithms.
What will quantum computers be able to do that ordinary computers can't do?
What's stopping us from building useful quantum computers? And how long until we'll have them?
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.
Some neat number tricks using numbers read backwards.