International Family Planning Perspectives Elwood Carlson is professor and Megumi Omori is Ph.D candidate, Department of Sociology, University of South Carolina, Columbia, SC, USA. The authors thank Kiril Donkov of the Bulgarian National Statistical Office, Tzveta Timtcheva and Christian Griva of the Bulgarian Ministry of Health, Marta Sougareva and Dimiter Filipov of the Institute of Demograph...

A broadly held view of bone is that it is a tissue defined by its mechanical and scaffolding properties, whose interaction with other organs of the body is similar to that exerted by an armor protecting them. In the last 10 years, using mouse genetics, this view of bone as an assembly of inert calcified tubes has considerably evolved to a much more dynamic picture. It is now clear that the skel...