Quote note (#333)
There must have been some selection for IQ – without it, our brains would have disintegrated. But that selection can’t have been very strong, or intelligence would have gone up like a rocket. Today it’s going down at a rate of something like three points a century – think what would have happened if it had changed that rapidly, either up or down, over the last couple of millennia.
If humans aren’t already too stupid to live, they will be soon.