learning a language is NOT about vocabulary or grammar rules

I think we've got it all wrong. Learning a language isn't about memorizing vocabulary or grammar rules. I was lucky enough to have learned a bit of Spanish while traveling in Latin America. When I was talking with the people there, I realized that they know a lot more words in English than I know in Spanish; for instance, they knew the English word for "blueberry" but I had no clue what it was in…