In this episode, we'll hear about the annual conference of the American Association for the Advancement of Science (AAAS), which took place last week in Boston. Nobel Laureate and AAAS President David Baltimore talks about the ongoing challenges of HIV vaccine research; NASA Jet Propulsion Laboratory Director Charles Elachi discusses the lab's next batch of missions; and Scientific American editor Mark Fischetti summarizes a few sessions he went to covering the environment. Plus we'll test your knowledge of some recent science in the news. Websites mentioned on this episode include www.jpl.nasa.gov; www.aaas.org

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