While I was watching the commercial for Fox's Terra Nova for the thirtieth time, something occurred to me: why would you send mankind's last hope back in time to Earth before the massive extinction event that wipes out the dinosaurs. Do the humans think they are so clever that they can at that catastrophe somehow? The humans have nowhere to flee except the past, as their Earth no longer has a future. So why not send them to a time period when they might have a good chance of survival? (And there is the time paradox: if they go back in time and disrupt history by preventing the evolution of higher mammals, will human beings come to exist in the first place?)

Maybe Steven Spielberg really likes dinosaurs and he them in his TV project, but the plot just sounds stupid. (And it appears the humans are prepared to live in a planet of dinosaurs, so I don't think they were jumping blindly into the past.)