Water, water everywhere?

We usually undervalue the commonplace. Clouds are less appreciated than rainbows, while rainbows are deservedly less exalted than the super-vivid circumzenithal arc, which dramatically appears overhead a few times a year like a spectral smiley-face. Yet it’s hard not to appreciate water, despite it being the most common compound in the cosmos.

Usually it manifests as ice or gas. For example, the rings of Saturn are countless ice chunks, and comet tails are mostly water vapor. It’s all around us, yet we nonetheless often regard it as beautiful.

Here on Earth, it mostly assumes its rarest . . .

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