Social networks based trust is a promising approach to supporting people and software agents to interact with “strangers” on the Web. A necessary condition for trust propagation in social networks is that trust is transitive. However, is trust transitive? What types of trust are transitive and why? There are few theories and models found to answer these fundamental questions in a formal manner....

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SOME of the more important indicators of the world social sitm1tion show a solid upward trend since 1050 but, in general, sock1 advance has been nneven in the diffei*eiit coiill,onents of tlerelopmerit, as well as in the cliffereiit countries and the different social groups within countries. In the economically less clereloped regions, progress was l~nrticnl:wly outstanding iii some of the indi...

Many microbes use extracellular signals to transmit information about population density and environmental conditions. Recent evidence suggests that the budding yeast Saccharomyces cerevisiae exhibits this type of regulation and that the signals are aromatic alcohols.

There is seemingly no end to the diffi culties that can arise in the international classroom. Stories abound about issues such as silence, students’ reticence, learner autonomy (or lack thereof), which seem to suggest an unsuccessful transfer of academic knowledge and skills across tasks, contexts and cultures. The current paper will neither offer another problem for us to ponder, nor another s...