The Center for the Biology of Chronic Disease (CBCD, http://www.cbcd.net) is a research center recognized by the IRS as a 501(c)(3) non-for-profit organization. The mission of the CBCD is to advance the research on the biology of chronic diseases, and to accelerate the discovery of treatments for these diseases. The CBCD published the "Purple" book entitled "Microcompetition with Foreign DNA and the Origin of Chronic Disease" written by Dr. Hanan Polansky. The book presents Dr. Polansky's highly acclaimed scientific theory on the relationship between the DNA of latent (chronic) viruses and the onset of chronic diseases. Dr. Polansky's book is available as a free download from the CBCD website. We invite biologists, virologists, scientists, and policy makers everywhere to download Dr. Polansky's book here: http://www.cbcd.net/.