Iron-plated snail could inspire new armor Full Article"snail has evolved a tri-layered shell structure consisting of an outer layer embedded with iron sulfide granules, a thick organic middle layer, and a calcified inner layer"
-nacre, or shell 95 percent calcium carbonate, a brittle ceramic, and 5 percent flexible biopolymer
=STRONG
actually, the MIT materials site has REALLY interesting articles on state of the art advances in all kinds of materials
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