Siri or Alexa can get you the weather, but don't expect a conversation. Neither can chatbots, once the next big thing, hold a back-and-forth. But researchers are now developing systems that leapfrog chit-chat to the next frontier: They can argue and play devil's advocate, Axios' Kaveh Waddell writes. Why it matters: Researchers are striving to make machines that can converse knowledgeably with humans and explain how they reach their conclusions. In the absence of advanced AI that can think intelligently, this system is another step in that direction.