[blam]

The salt water flooding of the previously fresh water Black Sea in 5,600BC caused the proto-Celtics living there to migrate up the river valleys all over Europe, bringing farming and their language with them.

[Cronos]

Sorry blam, maybe we should agree to disagree, but I've seen no real evidence or even proper reasoning to state that there was a Celtic culture distinct from proto-Aryan culture before 900 BC.