The footprints in their history stretch back 5000 years, but for the worlds greatest wall builders, makers of a forbidden city, what happens tonight is not merely a small step, but a great leap. China is welcoming the world. Who will they be when this is over? The clock of their lives has been beating with a screaming urgency. They have pushed themselves to be as sharp as a razors edge, for this summer, to be here, now, and nowhere else. Be