Scientists R Stoopid. Really Really Stoopid. The scientists described in the news article that is the basis for this blog post claim that the reason Russian people do not smile has to do with psychological factors. While that claim may have some small percentage of truth to it, that is not the real reason Russian people do not smile.
The actual reason Russians, as well as many Asian cultures, do not smile much is physical. The physical reason is related to the discussion in the news story about how people who smile are frequently viewed as fools by Russians and the people of various Asian cultures. Human beings who are physical weak in a particular way will have a tendency to smile frequently, while human beings who are physically strong in a particular way will tend to never smile.