What would make a computer biased? Learning a language spoken by humans

One of the amazing (and scary) things about artificial intelligence programs is that in learning to mimic their human masters so perfectly, these wonders of computer software hold up a mirror to patterns of behavior we engage in every day but may not even notice. Beyond their extraordinary usefulness in industry, medicine and communications, these "learning" programs can lay bare the mental shortcuts we humans use to make sense of our world. Indeed, new research with artificial intelligence programs highlights the ethnic and gender biases of English speakers. In a first-of-its-kind effort, a group of Princeton University computer scientists set a widely used artificial intelligence program to the task of learning English by performing a massive "crawl" of the World Wide Web. After gobbling up some 840 billion words, the software developed a vocabulary of 2.2 million distinct words, and the fluency to use them in ways that were grammatically correct.