Small, yes, but mighty: The molecule called water

From Health & Science - International Herald Tribune:

Some 380 million years ago, a few pioneering vertebrates first made the leap from water to land. And today, tens of millions of their human descendants seek summer amusement by leaping the other way. According to the travel industry, close to 90 percent of vacationers choose as their holiday destination an ocean, lake or other scenic body of water. We may have lungs rather than gills, and the weaker swimmers among us may be perfectly capable of drowning in anything deeper than a bathtub, yet still we feel the primal tug of the tide. Consciously or otherwise, we know we're really all wet.

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