David DaleMarcus DalyThomas DanforthHerbert Joseph DavenportEdward DavyCharles Gates DawesGerard DebreuJohn DeereAmasa DelanoOscar de la RentaWarren de la RueMichael DellWilliam Edwards…
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(Encyclopedia) Slovak literature. The earliest documents written in the Slovak language date from the 15th cent. Following the Czech Hussite movement, many Czech cultural leaders emigrated to…
(Encyclopedia) tracer, an identifiable substance used to follow the course of a physical, chemical, or biological process. In chemistry the ideal tracer has the same chemical properties as the…
(Encyclopedia) dream, mental activity associated with the rapid-eye-movement (REM) period of sleep. It is commonly made up of a number of visual images, scenes or thoughts expressed in terms of…
Influenza: A Twentieth-Century EpidemicEpidemics of the PastSmallpox: 12,000 Years of TerrorBubonic PlagueInfluenza: A Twentieth-Century Epidemic On June 28, 1914, Archduke Franz Ferdinand, heir to…