[LegendHasIt]

"I would think that rivers and mountains could be walled off in a fashion. It would require some very elegant engineering..."

The Chinese did it 500+- years ago, with manual labor. If we can't do it with the machines, materials and engineering that we have today, we deserve to be overrun by third-world invaders.

[Hawthorn]

>> The Chinese did it 500+- years ago, with manual labor <<

Sure. And the Great Wall successfuly kept the Manchu from invading and overthrowing the Ching Dynasty?