[T_S_]

My first thought: which parasites make you smarter?

[misterbwong]

Had the same thought, though the article says that the lack of infectious disease (parasites) would cause intelligence gain. The population of countries where disease is less of a problem wouldn't see the same benefit...

[joubert]

Me too. Although, then we'd probably call that relationship symbiotic and not parasitic.

[gojomo]

A local political establishment which will subsidize your technical education so that you can develop improved weapons systems?