It is true that Indians held supreme knowledge in Medicine, Warfare, Shipbuilding, Aircaraft, Dance, Music, Metalurgy, etc for thousands of years... and these were the reasons people used to come to India and not for some Spices... who would travel the thousands of kilometers of rough sea only for a few sacks of spices?...

And there is no proof that these came from the west... Not an iota of proof... so to say the Western people came to India and gave them knowledge about these things holds no water...