Empowered by artificial intelligence technologies, computers today can engage in convincing conversations with people, compose songs, paint paintings, play chess and go, and diagnose diseases, to name ...

The internet is a global collection of computers that know how to send messages to one another. Practically everything connected to the internet is indeed a computer – or has one “baked inside” of it.

These successes could be taken to indicate that computation has no limits. To see if that’s the case, it’s important to understand what makes a computer powerful. There are two aspects to a computer’s ...