Last night was the premiere of "Food Evolution", a documentary on the science in our dinner, and I saw it with a large audience for the second time.Wait, premiere? Second time? Which is it?It's both. And that is how it became a tale of two cities. And maybe even a metaphor for the two Americas we now live in.Two weeks ago I moderated a panel on communicating science and, more importantly, risk, at the University of Guelph, Canada's most prominent agriculture school. In the evening, there was a showing of "Food Evolution" in an auditorium there. I don't know how many people attended, it was packed, and before the movie there was a show of hands on how many people were okay with GMOs, how many distrusted them, and how many were unsure.