You grow the fastest by getting... adopting ideas and technologies from other cultures. And that has been proven in history, time and time again. Whether you go back to the ancient Persians, or the Romans, or the Ottomans. It's how a culture grows, by incorporating other ideas and going, wow, how did they do this? Oh, I bet you this works with this, and then you can improve it again. So I think any culture that sort of says, no no no, it's just us, nobody gets in anymore, it's the beginning of atrophy, and the rest of the world will just pass you.