Members of the Abuja "Bring Back Our Girls" protest group sit during a march in continuation of the Global October movement. Once again, Boko Haram militants are implicated in killings and mass kidnapping in northeastern Nigeria. Afolabi Sotunde/Reuters/Landov hide caption

itoggle caption Afolabi Sotunde/Reuters/Landov

A sculpture of oil workers in Caracas, Venezuela. The country is heavily dependent on oil exports, and falling oil prices have had a ripple effect on the country's already troubled economy. Ariana Cubillos/AP hide caption

itoggle caption Ariana Cubillos/AP

Civilians who had just recently arrived in Yola prepare to flee again, this time in a large open-top truck headed to the city of Jos. Ofeibea Quist-Arcton/NPR hide caption

itoggle caption Ofeibea Quist-Arcton/NPR

#BringBackOurGirls" campaigners participate in a lamentation parade in Abuja, in early November, as more towns in Nigeria come under attack from Boko Haram. Afolabi Sotunde/Reuters/Landov hide caption

itoggle caption Afolabi Sotunde/Reuters/Landov

Ramatu Usman, shown here with one of her sons, is a 37-year-old mother of eight. She says she was separated from one of her sons, 6-year-old Yahaya Buba, following an attack. He is still missing. Ofeibea Quist-Arcton/NPR hide caption

itoggle caption Ofeibea Quist-Arcton/NPR

People inspect the site of a suicide bomb explosion at the Government Science Technical College in Potiskum, Nigeria, Monday. Survivors say a bomber disguised in a school uniform detonated explosives during an assembly at the school. Adamu Adamu/AP hide caption

itoggle caption Adamu Adamu/AP

A child receives a polio vaccine during National Immunization Days in the Nigerian city of Kano. Diego Ibarra Sanchez /Courtesy of Rotary Foundation hide caption

itoggle caption Diego Ibarra Sanchez /Courtesy of Rotary Foundation

People call for the Nigerian government to rescue girls taken from a secondary school in Chibok region, during a protest earlier this month. Boko Haram, the group that took the girls, says they have been "married off." Olamikan Gbemiga/AP hide caption

itoggle caption Olamikan Gbemiga/AP

Earlier this month, people demonstrated in Nigeria's capital, Abuja, calling on the government to rescue girls taken from a secondary school in Chibok region in April. Now there are reports that militants of the extremist Boko Haram movement have kidnapped more girls. Olamikan Gbemiga/AP hide caption

itoggle caption Olamikan Gbemiga/AP

At the onset of symptoms, Dr. Adaora Igonoh (center) and her colleagues began drinking oral rehydration solution. It doesn't taste great but they say it helped them survive Ebola. They each downed over a gallon a day for nearly a week. Andrew Esiebo/Courtesy of WHO hide caption

itoggle caption Andrew Esiebo/Courtesy of WHO

Dutch Foreign Minister Bert Koenders (center) speaks with Luxembourg Foreign Minister Jean Asselborn (second from left) and British Foreign Minister Philip Hammond (right) during a round table meeting of EU foreign ministers in Luxembourg on Monday. The ministers hope to raise 1 billion euros to fight Ebola. Virginia Mayo/AP hide caption

itoggle caption Virginia Mayo/AP