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Cover Figure


COVER Scanning electron micrograph of an etched sample of the mineral skeleton of the marine glass sponge (genus Euplectella), showing the laminated silica cement that holds glassy fibers in place. The design principles of this sophisticated, mechanically stable structure are described on page 275. [Image: J. C. Weaver, D. E. Morse, and J. Aizenberg]

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Science. ISSN 0036-8075 (print), 1095-9203 (online)