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Where is there evidence for an actual sari in the Indus Valley Civilization? Here are figurines with clothing, none of them are in saris
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The red color seems well attested enough.
Instructions:
Go to sci-hub and in the search bar paste the DOI number of the paper which you want to read. the numbers you are looking for are after "doi.org/" in "https://doi.org/10.1016/j.jasrep.2016.05.034"
this papers DOI: 10.1016/j.jasrep.2016.05.034
there is no re-incarnation, karma/dharma in vedic ideas. There is RTA which is order, but the idea of you being born into a caste based on your good deeds is non vedic and from ancient magahda empire it seems. Source : https://www.amazon.com/Greater-Magadha-Studies-Cultures-Early/dp/8120835344
That's fair. There's a similar huge South/North divide in India (with NE India forgotten, of course), so it isn't a complete merger, similar to Europe not being a complete merger.
As for how Dravidian India became Vedicised, an interesting book I came across recently is https://www.amazon.com/History-Tamils-Iyengar-P-Srinivasa/dp/8120601459
The most recent theory by Joachim Matzinger is that Albanian is a pre-Illyrian Paleo-Balkan Indo-European language, related to Messapic spoken in what’s today Apulia, Italy. He believes Illyrians came from the Easter Alps and invaded the Adriatic parts of the Balkans, enslaving and pushing the “””native””” Balkan speakers in the interiors of the Balkans. This created a gap between Messapic and the ancestor of Albanian.
This theory is explained in depth in this book following both archeological and linguistic developments. Just like other Albanologists, he believes Albanian should not be classified as either Satem nor Centum, even though it shows some similar developments to Satem languages, because it preserved a three-way velar distinction in some positions, something no other Satem or Centum language does, a trait Messapic also seems to share.
This is the map on his book on where did Proto-Albanian develop.. Note that this is not a new theory, the region of development has been academic consensus since the 70s.
You could also read some classic Mary Boyce on Zoroastrianism:
There's a book called The Buried Soul - How Humans Invented Death by Timothy Taylor that goes into that
The number was 1 spartan for 11 helot. Read this poetry: https://en.wikipedia.org/wiki/Theognis_of_Megara with him complianing about "mixing" due to wealth. Read darwin's comment on this phenomenon. Read the rigspula. Read this: https://www.amazon.com/Defence-Aristocracy-Text-book-Tories/dp/111072862X
there was an ethnic component to these things atleast initially. But later on I agree it became purely societal. The same thing happened in India.
On a more curious note, you'll probably like the app Vanished Voices (also available for iOS) which presents a tree of Indo-European languages with a number of phrases reconstructed (and recorded) for each stage. It's developed by researchers at Leiden University, which shows in some of the reconstructions when you go back far enough, so those can be somewhat disputed.