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Summary. Most of the world's shorelines are in a state of erosion, prompting the search for ways to predict the future rate of shoreline retreat. In their Perspective. Cool math games online minecraft license info. AAAS is a partner of HINARIAGORA OAREPatientInform, CHORUS, CLOCKSS, CrossRef and COUNTER. Save to my folders. This article is available to AAAS members. Galvani believed that nerves were insulated by a nonconductive coating—which we now know as myelin—and that electrical impulses traveled through them to muscle cells via small holes, an idea that anticipated the structures that we know today to be ion channels.