with evan osnos, orville shell, chai ling, nick kristof. join us for a conversation about the history and the implications of tianamen square. >> to be in the square during the weeks leading up to june 4 was like being at some incredible festival almost, the feeling of sort of elation as if something had lifted. the press for the first time was absolutely free. people all across china were watching what's happening. and it was an amazingly feeling of sort of sudden lack of repression, and everybody, i think, believed that this was an inflection point. >> rose: a moment of change. >> they would never get this thing-- this jeanie back in the bottle. but, of course, that was a very naive presumption. >> rose: we conclude with jeff widener, the man who took one of the most famous pictures of all time, a young man in front of a tank. >> then suddenly, we heard a noise down the street, and it was a familiar sound of tanks. i went to the balcony, and i thought this is a nice composition air, compressed shot of the tanks, and then a man walks out k