There is an interesting comment in the Discover post, where Carl Zimmer (author of popular science book on parasites) points out several studies from all around

There is an interesting comment in the Discover post, where Carl Zimmer (author of popular science book on parasites) points out several studies from all around the world (Jamaica, China, Indonesia, Philippines) where they found children got smarter after de-worming: http://blogs.discovermagazine.com/notrocketscience/2010/06/29/does-national-iq-depend-on-parasite-infections-er/#comment-10704 http://blogs.discovermagazine.com/notrocketscience/2010/06/2...