Disease and intelligence: Mens sana in corpore sano: "
Parasites and pathogens may explain why people in some parts of the world are cleverer than those in others
HUMAN intelligence is puzzling. It is higher, on average, in some places than in others. And it seems to have been rising in recent decades. Why these two things should be true is controversial. This week, though, a group of researchers at the University of New Mexico propose the same explanation for both: the effect of infectious disease.