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Southern Africa's food crisis becomes urgent
External Resource
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Drones are transforming agriculture
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Waterflows decrease in Nepal Himalayas
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Warm ocean waters eat away at Antarctica ice
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Indian foreign policy toward Africa is complex
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GM mosquitoes succeed at reducing dengue
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Gates: Africa's youth will drive innovation
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At AIDS conference, one question dominates
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Oil spill cleanups are largely ineffective
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Solar tower generates energy from molten salt
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