This folder contains the materials for my submission to the Encyclopedia of Energy. The following files are contained in the folder... (0) README -- this file. (1) The Word document has the information requested for the article: Title, Author Name, Author Affiliation, Outline, Glossary, Concise Definition. (2) The source files for the manuscript are in LaTeX. The main file is called all.tex. The individual sections are sec1.la, sec2.la, ... sec8.la. The file allfigures.la copies together all the figures. (3) Postscript version of the manuscript is all.ps. (4) PDF version of the manuscript is all.pdf. (5) The EPS files for all the figures are 10 files with .eps name extension. Daniel R. Stump Department of physics and Aastronomy Michigan State University phone: 517-355-9200 ext 2035 e-mail: stump@pa.msu.edu