Sorry guys, nothing to do with the origional posting but I thought I can share something useful to you. I am a hardcore opponent of caste system, which is non-scientic, irrational and regressive. However, I am kind of interested in peculiar kind of history, not the political one :). We believe we are very civilized but we hardly have a written history of few hundred years. China has written history of more than four thousand years. Egypsians had developed writings more than 5000 years ago. So, what I am going to say may not be written in your Hisotry books; accept it if it sounds rational otherwise reject it. Or you may go an ask to some of your knowledgable trustworthy elders. When India were attacked by Muslims, the so called upper casts migrated towards north. Out of three upper casts, ie, Brahman, Kshatriya, and Vaishya, only Brahman got migrated in large quantiy to save their Sanatan Dharma. It was because most of the Kshatriyas got killed and Vaishya accepted the Muslim rule. This is the reason why you don't see any Vaishya in Nepal which have Indian roots. And there are very few India rooted Kahatriyas as well.