Article [3] is pretty terrible, he doesn't make very many coherent arguments. IQ is subject to the same mixing, complex influences, mutations and trade-offs as other heritable traits (such as physical strength and lifespan, which also have no immediately obvious downsides), and writing a long article doesn't invalidate that. For example, this line is utter stupidity:

> This constant churn of genetic variation works against any long-term rise or fall in intelligence.

How did humans evolve then?!