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Italian olive trees are withering from this deadly bacteria

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Paris summit ends with major climate blueprint

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Will the Paris accord change our climate outlook?

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What stagnant diversity means for America's newsrooms

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Terror threat shuts down schools across Los Angeles

Terror threat shuts down schools across Los Angeles

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Why we should embrace innovative fashion, not laugh at it

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PBS News Hour

NIH ends all medical testing on chimpanzees

The National Institutes of Health has decided that it will no longer allow its chimpanzees to be used for biomedical research for human health. NewsHour's Stephen Fee reports.