Next week, if all goes according to plan, a small mountain of snow will be melted, repeatedly sterilised and then injected in a high-pressure stream of near-boiling water to clear a bore-hole through the two miles of the ice-sheet.
"The idea is that the same thing is true for colors, that there are certain kinds of colors that are characteristic of stuff that's good for us as a species -- clear sky, clear water -- and stuff that's bad for us, like rotting foods, biological waste products, " he said.
Gorges and karst plateaux feature 700 caves, hundreds of sinkholes, a 9-km-long thermal-water maze under a town and more than 1, 600 clear-water springs.
Flood warnings remain in place in England and Wales as water-ravaged towns begin to clear up.
Unfortunately, if your kids are only looking for the next rollercoaster thrill, the Dream's Aquaduck, a 765-foot clear water slide that cantilevers 12 feet out over the ocean, will not match up.
The visibility of the water reaches 12m, allowing crystal-clear glimpses of shoals of Atlantic fish and billowing seaweed.
The most famous spring is Cleopatra's Bath, which has crystal-clear natural spring water that gurgles up into a large stone pool, and is a popular bathing spot for locals.
His latest: an alcohol-spiked spring water called DNA. Coming in a 0.35-liter clear bottle, the peach-flavored beverage doesn't taste like booze, but it does contain 5% alcohol slightly more than most beers.
Many tributaries running through the forest had dried up due to wide-spread clear-cutting and they said fertilizers were polluting the water.
However the government in Cardiff Bay has adopted a series of measures designed to put "clear red water" - to quote the former First Minister Rhodri Morgan - between Wales and Westminster.
In some cases, sunlight shines through holes in the cavern ceiling, illuminating the beautifully clear, blue-tinted water giving it an otherworldly feel.
Ecosystems and environmental change: over the past decade it has become clear that most of the deep-water ecosystems (cold-water corals) are highly influenced by the presence of deep-water circulation.
While there has been some talk about using these bags on a regular basis for long-distance bulk water deliveries, they seem to have a clear role to play in emergencies.
FORBES: Water Emergencies: Time for New Plans and Technology
Of course, Mr Letwin and Mr Cameron, both old Etonians, may simply be attempting to put some clear blue water between themselves and the more populist - or wilfully philistine depending on your point of view - elements on Labour's front bench.
He settles into a seat in a wood-panelled restaurant overlooking the water and recalls in a strong, clear voice his experience of that night.
Silverio Sandolo backs the Sparviero out into clear water and sends the boat nosing past the sleeping mega-cruisers, trim yachts and other fishing boats not making the dawn run.
Whether filming hippos in the clear water of Mzima Spring, flamingo chicks in a dried-out soda lake or the complex layers of life within a massive baobab tree, the Roots always let their subjects tell their own stories making astonishing discoveries along the way.
As these inappropriately dubbed "fat cats" tuck into modest portions of healthy food, sipping water or smoothies, it becomes clear that their wealth has not inspired excess - or at least not excessive eating.
It said clear, sterile water would be discharged and there would be a back-up system in case of error.
Its characteristic features are the landforms shaped by the Ice Age: glacial ridges, pine and lichen-clad heaths, kettle holes and small ponds filled with crystal clear water.
The stream showed clear and smooth-looking in the glasses and, below the curl of the falling water, the spray from the dam was blowing in the wind.
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