 The next stop on our water tasting tour is not far away, on a rooftop in Scottsdale. We're going up onto the roof. Thank you. Oh yeah, it is bright. We're surrounded by beautiful desert hills shimmering in the heat. I'm totally going to get vertigo. We came to the roof, not for the view, but for a glimpse at a mind-blowing piece of technology. So there are one, two, three, four, five...