Sources for disease model
M, Diane. "How Is Common Cold Spread?" LIVESTRONG.COM. Livestrong, 8 Aug. 2010. Web. 09 Aug. 2012. .
"Ebola Virus." - Department of Molecular Virology and Microbiology. BCM, 31 July 2012. Web. 09 Aug. 2012. .
"Birth Rate." The World Factbook. CIA, n.d. Web. 09 Aug. 2012. .
"Deaths and Mortality." FastStats. Centers for Disease Control and Prevention, 29 Mar. 2012. Web. 9 Aug. 2012. .
Shodor Logo. N.p., n.d. Web. July-Aug. 2012. .