This tenth volume in the Poincare Seminar Series describes recent developments at one of the most challenging frontiers in
statistical physics - the deeply related fields of glassy dynamics, especially near the glass transition, and of the statics
and dynamics of granular systems. These fields are marked by a vigorous interchange between experiment, theory, and numerical
studies, all of which are well represented by the leading experts who have contributed articles to this volume. These articles
are also highly pedagogical, as befits their origin in lectures to a broad scientific audience. Highlights include a Galilean
dialogue on the mean field and competing theories of the glass transition, a wide-ranging survey of colloidal glasses, and
experimental as well as theoretical treatments of the relatively new field of dense granular flows. This book should be of
broad general interest to both physicists and mathematicians.