[Little Bill]

I have done a lot of reading on the Indus Valley Civilization. I kind of get the hint that winds thing was known well before the Romans.

[colorado tanker]

It's a little hard to miss a climate event that happens every year and brings India 80% of it's rainfall. :-))

I'm guessing the advent of the Roman trade had more to do with the absorption of Egypt into the Empire and for the first time in centuries bringing relative stability, allowing people in that part of the world to venture out.