The video agent demoed as part of Google Beam is an experiment, and it's shockingly realistic. Is this a helper, or a replacement for people? Sitting down in a comfortably air-conditioned booth in the overheated outdoor demo landscape at Google I/O this week, I had a pleasant and uncanny chat with a smiling person who wasn't actually there. Nor were they even a real human being. The booth ... [3238 chars]