I've wondered why people aren't more intelligent. Why isn't everyone as intelligent as Ashkenazi Jews? And it may be societies work best when there's a mixture of abilities-the bright people would never be an army. Or has our intelligence been limited by leaders killing off any potential competitors? I suspect time is not a factor. The Ashkenazi Jews have a thousand years. So these are the sorts of things we'll find out-how many mutations would you need to be more intelligent?