Perspective Materials Science

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Science  08 Jul 2005:
Vol. 309, Issue 5732, pp. 253-254
DOI: 10.1126/science.1113954

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From sea urchin teeth to mammalian bones, the skeletons of organisms often contain several levels of structural hierarchy, designed to resist mechanical damage. In his Perspective, Currey describes several such hierarchical systems, highlighting in particular the high level of hierarchical organization in the skeleton of the deepwater sponge Buckle With Women Sandals Leather Wide Sandals Summer Aubergine Sandals Sandals Narrow Foot Sweet Customizable Shoes Sandals Foot Euplectella (described by Aizenberg et al. ). The complex structure of biomineralized systems probably serves mostly to avoid the traveling of cracks through the structure; Currey suggests that the chemistry of the mineral used in a skeleton is much less important than how this mineral is arranged in space.