Human height and the way we develop can serve as an indicator of a couple of important welfare components.
Really? Which welfare components? Nutrition I bet, but what are the others?
Health is the other component.  In certain places with poverty and bad environments, delayed growth can occur from malnutrition.
What else can you tell me about it?
I do know that when certain populations of people share genetic backgrounds, the average height is a characteristic within the group.  Most likely because of the nutrition and other averages for that demographic.
Interesting! Do you know where the tallest people live?
Not in particular but I can tell you that height and intelligence have a positive correlation!
Really? Is that because of the welfare components you told me about earlier?
Well it comes after a control for a socioeconomic class and the parents of the individuals education.