After a report from Betty Ann Bowser on the CDC's latest efforts to stop the spread of the H1N1 flu, Margaret Warner talks to health experts about what's being done to better understand how the virus works and why it…
By PBS NewsHour
The U.S. Fish and Wildlife Service postponed a recommendation originally due Wednesday on listing the polar bear as threatened under the Endangered Species Act due to changes in its habitat from global warming.
The extinction of dinosaurs over 65 million years ago did not foster a breeding ground for ancestors of modern-day mammals, as scientists had previously thought, according to a study released Thursday in the journal Nature.
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