People who live in countries where disease is rife may have lower IQs because they have to divert energy away from brain development to fight infections, scientists in the US claim.
The controversial idea might help explain why national IQ scores differ around the world, and are lower in some warmer countries where debilitating parasites such as malaria are widespread, they say.
Whenever a theory comes along that posits an explanation other than genetics to explain IQ discrepancies, IQ becomes a valid subject.
The rest of the time IQ is derided as outdated pseudo-science.
Liberalism exists only on the benevolence of unending hypocrisy.