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Overview: First described in 1981, HIV is a distinctly modern disease. But for how long before its discovery did HIV lurk unnoticed in human populations? This news brief from November 2008 describes new research offering insight into when (and how) HIV got its start. Author/Source: UC Museum of Paleontology Grade level: 9-12 Time: 20 minutes Teaching tips: This article includes a video podcast, a set of discussion and extension questions for use in class, and hints about related lessons that might be used in conjunction with this one. It is particularly appropriate for AP students. Get more tips for using Evo in the News articles in your classroom. Concepts: An organism’s features reflect its evolutionary history. Scientists can test ideas about events and processes long past, very distant, and not directly observable. As with other scientific disciplines, evolutionary biology has applications that factor into everyday life. Teacher background: Classification/Phylogenetics Relevance

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