Part I: Fundamentals and Elasticity -- 1 Time derivatives in material and spatial description – What are the differences and why do they concern us? -- 2 The Cosserats’ memoir of 1896 on elasticity -- 3 On equivalent inhomogeneities for particles with multiple-component interphases -- The influence of distributed dislocations on large deformations of an elastic sphere -- 4 Part II: Visco-Elastic Media and Coupled Phenomena -- 5 A closed-form solution for a linear visco-elastic self-graviting sphere.