Book excerpt: A whimsical construction of an imaginary dialogue between two people intent on understanding esoteric topics that range from human sexuality to physics. Ehrlich (physics, George Mason U.) is dedicated to making the sciences fun and interesting, and though the conceit is "cute," the information it contains is dynamic and scientifically sound, posing interesting questions and speculations on life in the universe, human behavior, perception, gravity, material properties, physics, time, space, and a sample list of "What ifs?" to pursue on one's own. The answer to the title's question (we were dying to know) is that, in part, it's all a matter of probabilities. The promotional material says the cartoons are humorous. Not. Annotation copyright by Book News, Inc., Portland, OR