live in london and i haven't really noticed this effect, maybe because out of 7.5 millions people it's really hard ot find something.
anyway, what i think you might find in your research is that people living in the cities are more likely to get respiratory desease than the other
when i come out of my house, it is so bad how much it stinks. but, what can we do!
I remember a study done a number of years ago about how living in a city was like the equivalent of smoking so many packs of cigarettes per day. My
smallish hometown (pop. 1 million) was about 1-2 packs per day, whereas somewhere like London was 5 packs a day! and I'm moving there in a couple of
weeks! oh well think of those idiots who live there and still smoke.
As to the height, nutirition is also a factor, in North Korea people are much shorter than the South Koreans because they lack proper nutirition. Lack
of sleep is another thing that can stunt growth. So shortness is a combination of nutrition, environment and genetics.
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