It seems that the brain has a "small world" architecture - or at least the cortex does. Everything can connect to everything else in a few synaptic steps.

Even philosophers who did not mind psychology, claimed the brain was irrelevant because it was the hardware, and we only need to know about the software.

Knowing about the neurobiological and evolutionary basis for social behavior can soften the arrogance and self-righteousness that often attends discussions of morality. It may help us all to think a little more carefully and rationally.

It is important to understand that while oxytocin may be the hub of the evolution of the social brain in mammals, it is part of a very complex system. Part of what it does is act in opposition to stress hormones, and in that sense release of oxytocin feels good - as stress hormones and anxiety do not feel good.

I used to suspect that in the brain, time is its own representation. I now think the problem is so much more complicated. Initially I was rather impressed by the experiments showing that on complex problems, subjects who are distracted do better in getting an answer than either those who answer immediately or those who spend time reflecting on the problem.

Remember, in the heyday of vitalism, people said that when all the data are in about cells and how they work, we will still know nothing about the life force - about the basic difference between being alive and not being alive.

I am less attracted to guesses about what cannot be done, than about making progress on a problem.