200 BC: Greek - Chinese exchange

Chinese gave the Greeks nickel to use in their minting of coins

                   ---->   First use of nickel in coins by the Indo Greeks in Bactria (Agathocles & Pantaleon)

The Greeks gave the Chinese the art of building city walls for protection

                  -----> The building of Walls of China started that time and continued for a long time


See numerous examples under "Ancient Greeks in Central Asia"

crop circle on an apple!

Mikrasia in posters: its Greek heritage