April 30 – Swiss mathematician Daniel Bernoulli presents a paper at the French Academy of Sciences in Paris in which "a mathematical model was used for the first time to study the population dynamics of infectious disease."[2]
^Roberts, Charles (2011). Ordinary Differential Equations: Applications, Models, and Computing. CRC Press. pp. 139–140.
^Singy, Patrick (2003). "Friction of the Genitals and Secularization of Morality". Journal of the History of Sexuality. 12: 345–64. doi:10.1353/sex.2004.0015. JSTOR3704892.
^Laqueur, Thomas W. (2003). Solitary Sex: A Cultural History of Masturbation. New York: Zone Books. ISBN1-890951-32-3.