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1 of 5
According to estimates by the United Nations, the average humanitarian crisis lasts:
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2 of 5

Fake online reviews litter sites like Amazon. To identify and delete them, sites should:
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3 of 5
Programs that allow utilities to reduce a household’s energy usage temporarily, to curb systemwide usage during peak times, in use for years:
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4 of 5
Modern day societies that have grown out of animal herding cultures:
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5 of 5

Sending primary care physicians data on how they rank against peers in getting patients to schedule preventive care tests: