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The Food Chain's Weak Link: Tiny Ocean Plants DyingMicroscopic plants in the ocean are among the most important creatures on Earth and produce half of the planet's oxygen. But they are in trouble. A new study finds that since 1950, the amount of phytoplankton in the ocean's surface waters has declined by 40 percent.
Scientists Say A Gel Can Slow HIV SpreadResearchers meeting at the 18th international AIDS conference this week say a new vaginal gel can cut HIV transmission rates in half, if used properly. AIDS experts Anthony Fauci and Kevin Fenton join Ira Flatow to discuss the gel study, and other news from the conference.
Why Do We Like What We Like?Why do we enjoy things like bitter foods and horror films? And are we the only species that likes art? Paul Bloom, professor of psychology at Yale University and author of <em>How Pleasure Works,</em> explains our penchant for art and why we find some unpleasant things so enjoyable.