On: Too many men suffering in silence, national health report finds

to be fair to the spirit of the idea, hot weather can be just as oppressive. Maybe adversarial conditions is more the point?

Right, that's my point. The hypothesis is specific to cold climates; it's a just-so story about why southern "races" are less intelligent, and it falls apart instantly on first inspection, unless you think evolution just started to happen 200 years ago.