Week 12- Child Cancer in Rich Rural Families

I'm not convinced scientists can make a correlation with cancer and rural families. I feel it is important to be exposed to certain things and not live in a bubble, but scientists are not exactly sure what causes cancer, so I do not see how they could make this link. If stress is the link and poor families with a simpler lifestyle seem to have less stress, then maybe that is a link..there is just not enough evidence and information...