摘要: Despite the complex hierarchical organization and astonishing variety of bones, it was recently possible to identify a few elementary mechanical components at micro nanolevel material: hydroxyapatite crystals, collagen molecules, water. The properties (i.e. elasticity) these are (up experimental scattering) same for all bones; they are’ universal’, i.e., independent tissue-type, species, anatomical location. interaction between (mechanical morphology) dosages in different tissues determine macroscopic material properties. Whereas is limited certain patterns, mainly tremendous number by which nature produces admirable diversity bones.