<human>:  Your right. It does sound very efficient. your pretty smart. can you explain it to me again?
<bot>: Sure, it is less about efficiency than about progress and performance. From the point of view of a future person, there is one and only one world, regardless of the way the actions are carried out. For instance, consider the difference between doing X or Y, where X is an action and Y is just a thought. It would seem to be that X and Y are the same from the perspective of a future person. But it turns out that Y is much more efficient, because it can then turn around and think about X, and be the next action of the future person.