Yes, lack of interactivity. Computers with explicit or implicit limits on their interactivity have been convincing people they're human for a long time. It se

Yes, lack of interactivity. Computers with explicit or implicit limits on their interactivity have been convincing people they're human for a long time. It seems like the only thing that's hard for robots is when someone uses language to set a different structure of interaction - if you say, "draw a picture with thus and thus shapes, then tell me what it looks like" and similar things.