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This book is a treatise on time and on background independence in physics. It first considers how time is conceived of in each accepted paradigm of physics: Newtonian, special relativity, quantum mechanics (QM) and general relativity (GR).  Substantial differences are moreover uncovered between what is meant by time in QM and in GR. These differences jointly source the Problem of Time: Nine interlinked facets which arise upon... more...

Only now, at the beginning of the new millennium, is there an up-to-date, comprehensive study of the cactus family. This long-awaited, monumental work covers the Cactaceae in an encyclopedic manner, addressing 125 genera and 1810 species. The most comprehensive single resource on the subject available today, it includes more than 1000 color photographs in addition to other illustrations. The introduction to each genus concentrates on the discovery of... more...