Other than perhaps in literature, nobel award has got a direct link with the quality of research facilities available to the aspirants. Quality of research facilities again directly varies with the economic well being (GDP) of the country.No wonder most of the nobel prize winners are from USA irrespective of the individual identities of the prize recepients as to where they originally hail from. It is baseless to identify a nobel prize winner as citizen of any other country other than the country where he could do his research work.
