I'm guessing a large part of the reason we have energy-intensive large brains is that keeping track of what one half the tribe thought and also what the other h

I'm guessing a large part of the reason we have energy-intensive large brains is that keeping track of what one half the tribe thought and also what the other half of the tribe thought (and also who is in which half) about what happened around the campfire last night needs far more representing power than always living with a unique ground truth; see also https://news.ycombinator.com/item?id=40522921 https://news.ycombinator.com/item?id=40522921