It's the old idea that the process of evolution is some push in the direction of greater complexity--in particular greater intellectual complexity. In one twig of the tree of life, namely ours, having a big brain happened to have advantages. But that's just what worked for a particular species of primate 5 to 7 million years ago.
People talk about human intelligence as the greatest adaptation in the history of the planet. It is an amazing and marvelous thing, but in evolutionary terms, it is as likely to do us in as to help us along.
A...reason we are so-so scientists is that our brains were shaped for fitness, not for truth. Sometimes truth is adaptive, but sometimes it is not.
Modernity is a desert, and we are jungle monkeys. And so new evolutionary selective pressures are coming to bear upon the human situation, new ideas are coming to the fore. Psilocybin is a selective filter for this. The wish to go to space is a selective filter for this. Just the wish to know your own mind is a selective filter for this.
We're [humans] running great risks of doing things that will not be good for us. The cost can be very high indeed if we reach the point where we can't adapt to our own increasingly rapid adaptations. We run the risk of early extinction. So this certainly isn't a triumphalist story, but it is trying to get at what, in the very long run, leads to the amazing creatures that we are.
We accept that people are irrational for good Darwinian reasons. But I don't think we should be so pessimistic as to think that therefore we're forever condemned to be irrational.
Amidst the vicissitudes of the earth's surface, species cannot be immortal, but must perish, one after another, like the individuals which compose them. There is no possibility of escaping from this conclusion.
No practical biologist interested in sexual reproduction would be led to work out the detailed consequences experienced by organisms having three or more sexes; yet what else should he do if he wishes to understand why the sexes are, in fact, always two?
For three million years we were hunter-gatherers, and it was through the evolutionary pressures of that way of life that a brain so adaptable and so creative eventually emerged. Today we stand with the brains of hunter-gatherers in our heads, looking out on a modern world made comfortable for some by the fruits of human inventiveness, and made miserable for others by the scandal of deprivation in the midst of plenty.
