Research discovering the link between smoking and cancer has led to decreases in cigarette smoking in the past several decades. this demonstrates the role that can play in social change.

New ideas- even if the research is medical, the real reason focuses on the introduction of new ideas. 

Currently, as of february 2016, an american traveling in france would be by the exchange rate. the weakness of the euro and the strength of the us dollar means that items in france cost less to an american than they otherwise would. of course, if this trend reverses and the us dollar weakens and the euro strengthens, such as was happening in early 2008, an american traveling in france would have an adverse experience because items would cost relatively more.