United Nations

A newborn in Sierra Leone is treated after delivery by Caesarean section. The country's child mortality rate has dropped from 264 per 1,000 in 1990 to an estimated 120 this year. Lam Yik Fei/Getty Images hide caption

itoggle caption Lam Yik Fei/Getty Images

The crowded streets of Kolkata, India, are only going to get more crowded. Randy Olson/National Geographic hide caption

itoggle caption Randy Olson/National Geographic

Syrian refugees live in makeshift shelters in the Beqaa Valley in Lebanon, just a few miles west of the Syrian border. Jason Beaubien/NPR hide caption

itoggle caption Jason Beaubien/NPR

A baby helps make history. The Kenyan child is receiving the new malaria vaccine — the first ever that can wipe out a parasite — as part of a clinical trial. Karel Prinsloo/AP hide caption

itoggle caption Karel Prinsloo/AP

Ioanna Mattke holds Raven, one of six hens that her family owns. The Mattkes have raised Raven since she was a day old. Jason Beaubien/NPR hide caption

itoggle caption Jason Beaubien/NPR
Alyson Hurt/NPR

At the health clinic in Minjibir, Nigeria, a child is immunized for polio. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

A police officer guards the home of a family under a 21-day Ebola quarantine in Freetown, Sierra Leone, back in March. Michael Duff/AP hide caption

itoggle caption Michael Duff/AP

A dangerous nuzzle? A man in western Abu Dhabi hugs a camel brought in from Saudi Arabia for beauty contests. Middle East respiratory syndrome circulates in camels across the Arabian Peninsula. Dave Yoder/National Geographic hide caption

itoggle caption Dave Yoder/National Geographic