We hear about the Silk Road all the time.
As I had erroneously thought earlier, there was no single source and destination.
There were many sources, hubs and several destinations and trade occurred both ways.
Here is an interview with a trader along one of the routes.
So interesting to hear about real experiences!
I wonder how many of the precious things on my shelves have come along this route ….. some silk thread maybe? Some silver maybe? What if some of world lines actually did cross …all these ruminations lead to nowhere but are such happy wistful mental engagements 
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jm
