Biologist argues human intelligence was highest 3000+ years ago

I'm not buying that:

Genetics are only part of the story. Environmental factors contribute to intelligence too. If you had to be working an a factory 12hrs a day as a child in the 1800's, you could've been genetically "intelligent", the environment would never have nourished that.

It is through abolisment of child labour, institutionalised education and dedicated parental support that the average joe got the ability to develop himself and become more intelligent than his parents.

Here's a link to a free version of said paper: http://bmi205.stanford.edu/_media/crabtree-2.pdf

I could buy that, but try and prove it.

There's a strong correlation between our intelligence and all of the other crap we have going on. We've got too much crap going on right now.