Across Silicon Valley, technology companies are scrambling to make their software smarter with the help of artificial intelligence. Both Apple and Google have made significant improvements to their virtual assistants, Siri and Google Now, that help them better understand what a user might need before he or she asks. Meanwhile, Facebook has unveiled plans to create its own intelligent chat bot that can perform tasks on your behalf. As of this week, Apple has more firepower in the AI department. The Cupertino, Calif.-based company has purchased Emotient, a company that uses artificial intelligence to interpret a person's emotions, The Wall Street Journal first reported Thursday.