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In places like Antarctica, small things can make a difference. Scientists are finding that penguin waste is helping form clouds, which could be offsetting the effects of climate change.

Dr. Joanne Liu of Doctors Without Borders says fear and a lack of sense of urgency has kept the international community in their home countries rather than stepping up to the plate in West Africa.

Scientists launched a large trial Monday to test two vaccines. But testing Ebola drugs in West Africa is proving more difficult than expected because the disease is disappearing rapidly.

International aid groups say the decline in volunteers is due to quarantine restrictions imposed by New York and New Jersey.

The residents of Bamako, Mali, are in shock after Friday's deadly terrorist attack on a hotel, for which an al-Qaida linked group has claimed responsibility.

The memorial service for Nelson Mandela concluded Tuesday in Soweto, but South Africans will have additional opportunities to say farewell to their late president. Mandela lies in state in Pretoria for three days and will be buried Sunday in his home village of Qunu.

Nelson Mandela will be laid to rest Sunday in his rural homestead of Qunu, which leaves this modest region to cope with the influx of thousands wishing to pay their last respects.

NPR's Steve Inskeep talks to Associated Press reporter Aritz Parra about the more than 8,000 Moroccan migrants who arrived in the Spanish-African enclave of Ceuta, creating a humanitarian crisis.

The WHO issued interim guidance on usage of the AstraZeneca vaccine, after a small study found low efficacy against coronavirus variants.

Nigerian President Muhammadu Buhari meets President Obama on Monday. The problems facing Nigeria include extremists who have abducted hundreds of schoolgirls.