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Philosophy of Science is a crucial subset of philosophy, since it directly affects scientific research. We need to know what constitutes a properly constructed theory, and more to the point, which claims are not theoretical, or perhaps not even scientific. With that goal established, we need to know how to empirically verify the theory in question. Theories are developed within axiomatic systems, are based on assumptions, and present us with a compact thesis, or a set of theses. A theory is scientific if we can falsify it with empirical data. If a theory is not testable, then it is not a good theory, since we cannot accept or reject its propositions. An obvious point is to be raised here - when and under which conditions shall we reject a theory?

Methodological studies flourished in the XX century with the works of Karl Popper, Milton Friedman, Imre Lakatos, Harold Kuhn, Paul Feyerabend and other philosophers. The contribution of Imre Lakatos was significant. With his version of corroboration and refined fascificationism we were able to apply new standards towards the methods of rejection of scientific theories. A single rejection of the scientific theory is not likely to falsify it, unlike advocated previously. However, the main point is that while the absolute truth is always of importance, i.e. whether a given theory is considered "true" because we have not been able to negatively falsify that theory; it is more important that various theories can be compared to each other, even if they are all imperfect. To this end, we can specify a set of thresholds, and say that a research programme A is more empirically valid than a research programme B if it does withstand a larger number of empirical tests. Of course, as simple as it sounds, it is a useful method of evaluation of theories, and can be augmented as needed within a given science.

Philosophy of Science and methodology is of utmost importance to theorists, since more often than not, nonscientific methods of theory construction are used, and even worse, empirical data are inductively used to hypothesize about the causes for the pattern of these data. It's methodologically invalid and by construction, these theories are not falsifiable since they are derived from data. This is true especially within economic theory; labor economics and macroeconomics in particular.

The works of Lakatos are summarized and condensed in various descriptive volumes on the Philosophy of Science, however it is illuminating to read the original works of this ingenious philosopher, since by doing so you gain an additional layer of understanding.

I will not go as far as saying that it should have been a must reading for any scientist, since such proposition would be hardly realistic, but I will say that it is a treat for those who have already tasted methodology in a compact form, and would like to expand their knowledge.

Joanne Herschfield and David Maciel edit Mexico's Cinema, an important college-level history of Mexican cinema developments. Fourteen essays consider the first hundred years of Mexican cinema, exploring a range of themes and the history of its development.

This is, without a doubt, the perfect atlas for driving in Europe...and here are a few reasons why this is the only one you will need . 1)It offers a reference map on the back cover that allows you to turn instantly to the certain area of europe you are interested in 2)The scale is large enough to cover all of europe in a little over 100 individual maps but small enough to show you were individual castles, monastaries, and scenic routes are 3)The distance tool, although in km, gives the distance between any two points on the map and it is therefore possible to map out every day of your journey and know how far you should expect to be on the road. 4)The price...at any local bookstore you will pay 21-24 $ while here you pay only 14$ plus 2 bucks shipping and it comes right to your doorstep in a few days.

If you are like me, scanning different maps of europe looking for the most helpful one, than you can stop right here, because you will not be disappointed with this one...happy planning and happy travels...

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K. Theodore Hoppen's book is an invaluable resource for students and scholars of the Victorian Generation. The breadth of its scholarship is extraordinary. It is teeming with important information and provides references for further reading. The book significantly adds to the scholarship of Asa Brigg's The Age of Improvement since it considers the era after the Second reform Bill of 1867 which is crucial to understanding the direction of English history.

I picked up this title with the expectation of it being just another dry policy wonk-ish paper from the International Institute of Strategic Studies, but I was surprised to find it not just timely and interesting but also easy to read and understand. I sat down and finished it in one day and thoroughly enjoyed it. Mr. Thomas spells out clearly America's practical and political needs for undertaking future military operations in coalitions. Using examples of coalition operations of the past 2 decades, but particularly the examples of the Gulf War and Kosovo, he highlights the hindrances facing the US, France, Germany, and the UK--each with a unique set of circumstances--in building and contributing to future coalitions. He also proposes a realistic "division of labor" to allow each country to maximize its "competitive advantage" for effective contributions to future coaltions. Highly recommended for anyone interested in America's near-term defense and national security challenges.

The concepts in this book continue to make me contemplate my beliefs. Pally offers a cutting-edge look at the relationship between neuroscience and psychoanalysis. Though it is elegantly filled with detail, the concepts are easily accessible and engaging. Certainly a must read for anyone interested in the conscience and the brain.

Mobile Object Systems: Abstracts Introduction This bookpresents a collection of papers dealing with different aspects ofmobile computations. Mobile computations are computations that are not bound to single locations, but may move at will to best use the computer network's resources. In this view, the network becomes a single, vast, programmable environment. Among computer scientists, many feel that this approach will have a profound effect on the way we design and implement distributed applications, and they agree that we are witnessing a paradigm change. However, this new and exciting paradigm requires advances, both theoretical and applied, in fields such as programming languages (where we need a sound semantic foundation and efficient implementations), operating systems and software safety and security. Some of the first steps towards a programmable Internet are documented here. This book follows a particular approach to mobile computation. It emphasizes the synergy between mobility and object-oriented programming, hence the title Mobile Object Systems. Mobile object systems, in our view, are self-contained and autonomous groups of objects. They carry out a computation for an end-user in some initial computational environment and may dynamically change their environment for one that is on a remote computer. There is a close relationship between mobile object systems and research on so-called mobile software agents. In both cases, the focus is software mobility, but we prefer the terms mobile computation and mobile object systems as they are more accurate descriptions of the technology, while mobile agents has a fuzzy meaning that overlaps with artificial intelligence research. The papers in this book are more concerned with problems of software mobility per se. Nevertheless, the terms are quite close and are often used interchangeably even within the present work. The starting point of this book was a number of discussions and presentations given at the second International Workshop on Mobile Object Systems (MOS'96) held in 1996 in conjunction with the European Object Oriented Programming Conference (ECOOP'96) in Linz. The core of the book is made up of reworked versions of the submitted papers. However, we wanted to broaden the scope of this volume and survey a large portion of the research in this rapidly expanding field. We invited a number of researchers to contribute reprints of important papers or to write entirely new pieces. This book is the result. Overview The book is organized in three parts: (I) Foundations, (II) Concepts, and (III) Implementation, followed by an appendix. We detail the content of each part next. Part I of the book contains chapters giving background and motivation for the research on mobile computations. The chapter by Cardelli is a brief introduction to the issues and challenges of mobile computation. It is followed by a reprint of a paper by Tsichritzis, written twelve years ago, which describes many of the features we are looking for in mobile object systems using the animal world as a metaphor for mobile computations. The chapter by Waldo et al.was written in 1994 and convincingly argues against transparency in distributed computing. To some extent it motivates the work on mobile computations, as mobile computations naturally suggest making mobility and location visible to the programmer. The chapter by Chess et al.investigates advantages and disadvantages of mobile computations by looking at their application. The last chapter, by Tschudin, contains a philosophical and philological discussion of messages and instructions. Part II contains descriptions of systems and concepts for mobile computations. The chapter by Cugola et al.analyzes languages that support some form of code mobility, trying to compare them and get at some of the basic principles of those languages. The chapter by Acharya et al.presents Sumatra, a Java based environment for mobile applications. The chapter by Bharat and Cardelli presents Visual Obliq, an implementation of mobile computation based on Obliq. The chapter by Tschudin presents a messenger environment. The chapter by Mira da Silva discusses the relationship between persistence and mobility. The chapter by Vitek et al.considers security for communication between object systems. The chapter by Kato looks further into security issues. The chapter by Ciancarini and Rossi presents an architecture for coordination and communication on wide area networks that can be used between mobile computations or plain Java programs. Part III contains papers detailing implementation considerations and techniques. The chapter by Knabe looks at the trade-offs between different representations of agents and efficiency. In the second chapter, Franz presents a particular representation called Slim Binaries which is particularly well suited to mobile code, as well as a more general dynamic code optimization technique. The chapter by Dugan describes the implementation of mobility of polymorphic data in a strongly typed programming language. Finally, the paper by Dðmel discusses the implementation of a system that allows Java programs to interact with Telescript agents. We would like to thank the program committee of the MOS'96 workshop, Joachim Baumann, Luca Cardelli, Paolo Ciancarini, and Doug Lea, for their help and excellent reviewing. February 1997 J. Vitek and C. Tschudin Geneva and Zurich ------------------------------------------------------------------------ Objectworld D. Tsichritzis An environment is outlined in which programming objects collect and disseminate information, using analogies from the animal world. Objects have their own rules of behaviour. They coordinate their activities by participating in events. Objects get born, move around, communicate and receive information and, eventually, die. ------------------------------------------------------------------------ Mobile Agents: Are They a Good Idea? David Chess, Colin Harrison, Aaron Kershenbaum Mobile agents are programs, typically written in a script language, which may be dispatched from a client computer and transported to a remote server computer for execution. Several authors have suggested that mobile agents offer an important new method of performing transactions and information retrieval in networks. Other writers have pointed out, however, that mobile agents introduce severe concerns for security. We consider the advantages offered by mobile agents and assess them against alternate methods of achieving the same function. We conclude that, while the individual advantages of agents do not represent an overwhelming motivation for their adoption, the creation of a pervasive agent framework facilitates a very large number of network services and applications. ------------------------------------------------------------------------ A Note on Distributed Computing Jim Waldo, Geoff Wyant, Ann Wollrath, and Sam Kendall Much of the current work in distributed, object-oriented systems is based on the assumption that objects form a single ontological class. This class consists of all entities that can be fully described by the specification of the set of interfaces supported by the object and the semantics of the operations in those interfaces. The class includes objects that share a single address space, objects that are in separate address spaces on the same machine, and objects that are in separate address spaces on different machines (with, perhaps, different architectures). On the view that all objects are essentially the same kind of entity, these differences in relative location are merely an aspect of the implementation of the object. Indeed, the location of an object may change over time, as an object migrates from one machine to another or the implementation of the object changes. It is the thesis of this note that this unified view of objects is mistaken. There are fundamental differences between the interactions of distributed objects and the interactions of non-distributed objects. Further, work in distributed object-oriented systems that is based on a model that ignores or denies these differences is doomed to failure, and could easily lead to an industry-wide rejection of the notion of distributed object-based systems. ------------------------------------------------------------------------ Instruction-Based Communications Christian Tschudin This papers explores a mode of communication that is based on instruction rather than interpretation. Starting from Shannon's (interpretative) communication model, I link instruction±based communications to mobile code (messengers), to ªsignsº as they are defined in semiotics, and to the virus theme commonly found in cell biology, computer science and literature. Virus±codes are conjectured to be more powerful that the equivalence codes studied by Shannon. ------------------------------------------------------------------------ Analyzing Mobile Code Languages Gianpaolo Cugola, Carlo Ghezzi, Gian Pietro Picco, Giovanni Vigna The growing importance of telecommunication networks has stimulated research on a new generation of programming languages. S

This book has clear, concise information and diagrams for mobiles and every other kind of hanging decoration. Many great ideas for projects to do with kids. Most of the materials are readily available. Highly recommended!

I will be happy to recommend the Mole and Shrew books to the kids in my library! It's nice to see good friendship stories for younger kids - something with a little heart (not total fluff). Mole and Shrew are simple, genuine, fun critters, and readers will wish to visit them again and again. Adults will enjoy the "classic" quality of the fine illustrations!