Symbiosis

If you live in or near the Catskill-Delaware watershed, you can't help but be aware that the water in your backyard goes to New York City. Still, even if you know New York well, it's tough to imagine the sheer mass of the city that drinks from our waterways. How can you wrap your mind around nine million people?

This might help: The Denver Post has an amazing gallery of dozens of recent aerial photos of New York City. Check it out. Seriously, it's incredible. And while you're at it: Mull over the fact that, though you can't see it in the photographs, this mighty city has its roots deep in rocky Catskills soil.

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