<p>Presents fundamentally new ideas for describing dynamics in small molecules</p> <p>Describes the application of molecular symmetry calculations to formulate new models for internal molecular motion</p> <p>Compares a recent experimental work with theoretical calculations</p> <p>Covers three different hot topics in molecular spectroscopy: nuclear spin symmetry the motion of extremely floppy molecules and the ultrafast rotations of small molecules in hot environments</p>