Human intelligence is declining according to Stanford geneticist
rt.com
rt.com
Here's some reading material: http://www.guardian.co.uk/science/grrlscientist/2012/nov/14/...
And there's the last HN-thread with a lot of debunking going on: https://news.ycombinator.com/item?id=4818441
And of course, the Flynn effect completely contradicts this, mostly because the Flynn effect is actually based on data (IQ-tests in this case) and not just assumptions like Crabtree did it.
Paradoxically, though, this 'Stanford geneticist' seems to be evidence for his own findings.
The Flynn effect is the substantial and long-sustained
increase in intelligence test scores measured in many
parts of the world from roughly 1930 to the present day
Just look at all the vestigial crap we still carry around [1]: appendix, tailbone, wisdom teeth, inside corner of the eye, etc. We don't use these yet we don't loose them. And loosing these is propably much, much easier than intelligence, because the development of things like the appendix is controlled by much fewer factors than intelligence.
[1] Which might still have a purpose that we don't know yet, for example the appendix might be important in immune response: https://www.scientificamerican.com/article.cfm?id=what-is-th...