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It was entirely coincidental, but the last edition of the WaterShapes digital newsletter included two of the most popular of all articles ever to appear on our Web site:  Tommy T. Cook's "Casting Nature," which originally appeared in the printed magazine in November 2010; and Scott Cohen's "Beware of Exploding Lava Rocks," which was published exclusively through the newsletter on March 16, 2011. It's easy to recall how popular