Maybe everything we think we know about the world around us is wrong. A philosopher at Oxford University, Nick Bostrom, says there is a one in five chance that everything in the universe that we've interacted with is no more substantial than the graphics in a typical computer game. In fact, Bostrom suggests that we all maybe characters in such a game.
The philosopher's reasoning goes something like this: If we are on the verge of being able to create artificial life and we are constantly creating ever more sophisticated computers, there's every possibility that some other intelligent life-form has already gotten there.
