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CNN's Barbara Starr looks at rising extremist groups, especially al Qaeda affiliates and Nigeria-based Boko Haram, that are taking over regions of Africa.
President Obama takes a moment to reflect during his trip to Senegal. Jessica Yellin reports.
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George W. Bush visits African nations to support efforts to fight cervical and breast cancer.
RELATED STORY: Bush travels to Zambia, Botswana to raise cancer awareness