This episode was a perfect way to end the Possible Worlds series, it had such a sense of scientific hopefulness which was desperately needed in our times. It shows what the next world fair would look like in 2039 and you are given an in depth tour of what it could be like. Want to talk to your favourite person in history, travel to any point in time, now you can.
Neil also describes many scientific solutions to some very taxing problems that hinder the world today, but also explains that nature can give us many second chances and that it's still not too late to put all things right.
This episode along with all of Possible Worlds is a highly recommended viewing if you love science