In the first of two essays on the role of time in probability and quantum physics, Chung (Stanford University) explains why probability theory starts where random time appears and illustrates this idea with various probability schemes. In the second essay, Zambrini (Universidad de Lisboa, Portugal) shows why quantum physics is not a regular probabilistic theory and discusses the use of stochastic analysis for analyzing Feynman's path integral approach. Annotation (c) Book News, Inc., Portland, OR (booknews.com)