Spatial Databases: Technologies, Techniques and Trends Spatial database systems has been an active area of research over the past 20 years. A large number of research efforts have appeared in literature aimed at effective modelling of spatial data and efficient processing of spatial queries. This book investigates several aspects of a spatial database system, and includes recent research efforts in... Quantum Cosmology and Baby Universes Quantum gravity is notoriously a subject where problems vastly outnumber results. This is no surprise at short distances, on the order of the Planck length, where most of us expect quantum fluctuations in the metric to cause space-time itself to lose its meaning and gravity to be subsumed (along with the other so-called fundamental interactions)...
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