Christina Asima says she had no choice but to marry last year at age 12 to help care for younger siblings after her mother abandoned the family. But she says her husband was abusive, so she left him, and now must look after her 8-month-old son, Praise, alone. Jennifer Ludden/NPR hide caption

itoggle caption Jennifer Ludden/NPR

A child wearing the traditional eyeliner kajal peeps from behind a door in Allahabad, India. Rajesh Kumar Singh/AP hide caption

itoggle caption Rajesh Kumar Singh/AP

One experimental condom has tabs on either side so it's easier to put on in the dark. Courtesy of California Family Health Council hide caption

itoggle caption Courtesy of California Family Health Council

Yoset, a spiritual healer near Arua, Uganda, works with the Centers for Disease Control and Prevention to detect the plague in his village. Courtesy of Mary Hayden hide caption

itoggle caption Courtesy of Mary Hayden

A woman comforts a pregnant relative suffering labor pains at a makeshift birthing clinic in the typhoon-battered city of Tacloban, Philippines, on Monday. Erik de Castro/Reuters/Landov hide caption

itoggle caption Erik de Castro/Reuters/Landov

Military personnel from the U.S. and the Philippines unload relief goods at the Tacloban airport, Nov. 11, 2013. Some reports estimate that 10,000 people may have died in the city of Tacloban. Ted Aljibe/AFP/Getty Images hide caption

itoggle caption Ted Aljibe/AFP/Getty Images

A doctor vaccinates a child against polio at a health clinic in Damascus, Syria, on Nov. 6. To stop the disease from spreading beyond Syria, health officials plan to vaccinate 20 million children in the region. Youssef Badawi/EPA /LANDOV hide caption

itoggle caption Youssef Badawi/EPA /LANDOV

The Ethiopian government has set up about a dozen vaccination booths along its thousand-mile border with Somalia. Jason Beaubien/NPR hide caption

itoggle caption Jason Beaubien/NPR

Warren Buffett (left), Howard G. Buffett (center) and grandson Howard W. Buffett collaborated on a book about the challenges of feeding more than 2 billion more mouths by 2050. Scott Eells/Bloomberg/Bloomberg via Getty Images hide caption

itoggle caption Scott Eells/Bloomberg/Bloomberg via Getty Images

A young girl stands in the doorway of a home in Uttar Pradesh, India. The markings on the door show that a polio immunization team vaccinated children in the home. Alyce Henson/Courtesy of Rotary International hide caption

itoggle caption Alyce Henson/Courtesy of Rotary International