It's worth noting that despite the east-west orientation of Eurasia, there is quite little evidence of technology and agriculture actually being shared between the Mediterranean and Chinese origins, especially if you restrict yourself to the traditional origin-of-civilization innovations such as agriculture itself, pottery, metallurgy. By contrast, the Americas show a great deal more transmission along its north-south axis, with maize (from Mesoamerica) almost completely supplanting native North American domesticants, pottery appearing to come from the Amazon rainforest, and metallurgy arriving from the Andes.