Computers and other machines have and will continue to change the way people do business and how we live. Many researchers use the term artificial intelligence (AI) to describe the thinking and intelligent behavior demonstrated by machines. While AI can be helpful to human beings, scientists warn, it can also be a threat. We live with artificial intelligence all around us. A few examples are iPhone’s personal assistant Siri, searches on the Internet, and autopilot programs on airplanes. AI is not new. But it is quickly getting more and more complex, and, well, more intelligent. Stuart Russell teaches computer science at the University of California, Berkeley. He says humans should be sure to make AI products that we like. "If we are going to make systems that are going to be more intelligent than us, it’s absolutely essential for us to understand how to absolutely guarantee that they only do things that we are happy with.”