The journal “Science” has featured a report from the University of Texas concerning the sense of smell and the development of the brain in mammals in the long past.
The link is below, the thesis seems to be that when mammals began to be able to smell better and more effectively this jump started the development of the brain.
An implication of this is that if humans have high performance brains then this might just be because they had a sense of smell that enabled the thought processes to function far more efficiently and selectively.
As the scale and nature of air pollution in modern urban society probably means that most of us now have this sense seriously impaired does this mean that the urban human race is reverting to a dimmer and more dismal past?
http://www.sciencedaily.com/releases/2011/05/110519141603.htm
It might explain why so many things are going so badly wrong.
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