PBS NewsHour

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A polar bear keeps close to her young along the Beaufort Sea coast in Arctic National Wildlife Refuge, Alaska in a March 2007 file photo. Recent findings from a study of mating and movement behaviors of polar bears showed that the arctic marine...
Watch Video | Listen to the AudioHARI SREENIVASAN: And now to Viewers Like You: Your comments about some of our recent work. This week, your response to two extended interviews we did exploring the often tense relationship between minority...
WASHINGTON — Do students take too many tests? Given the complaints about a high-stakes testing culture in classrooms, some states are reviewing the quality and quantity of the tests their students take. Congress is getting into the act, too....