Fast-moving and ever-changing, stem cell science and research presents ongoing ethical and legal challenges in many countries. Each development and innovation throws up new challenges. This is the case even where new developments initially seem to solve old dilemmas. Sometimes it becomes evident that new science does not in fact solve old...

Volume 20 of the Handbook of Magnetic Materials, as the preceding volumes, has a dual purpose. As a textbook it is intended to help those who wish to be introduced to a given topic in the field of magnetism without the need to read the vast amount of literature published. As a work of reference it is intended for scientists active...

With the increasing popularization of personal hand-held mobile devices, more people use them to establish network connectivity and to query and share data among themselves in the absence of network infrastructure, creating mobile social networks (MSNet). Since users are only intermittently connected to MSNets, user mobility should be...