Thirteen-year-old Naserlalah Ibrahim, who lost his left leg during fighting in Syria, uses a frame to support himself as he learns to walk on a prosthetic leg fitted at a prosthetics clinic on March 24, 2015, in Reyhanli, Turkey. Border towns such as Reyhanli have received a large number of refugees, many requiring medical help after receiving injuries from bombings.
There is now a serious shortage of surgeons, wheelchairs, and artificial limbs in Syria after reports that approximately 567 doctors and medical workers have been killed during the war so far. Human rights groups have claimed that hospitals, clinics, and medical personnel have been deliberately targeted during the war. Carl Court/Getty Images
The High Altitude Cherenkov Experiment (HAWC) observatory on the slopes of Pico de Orizaba and Sierra Negra, near Puebla, Mexico, on March 20, 2015. Sitting at the foot of a volcano, this facility looks like a water treatment plant. In fact, it's one of the largest and most powerful observatories ever built on Earth. Unlike optical observatories that use telescopes to study planets and stars, the HAWC detects high-energy cosmic particles to unravel the mysteries of black holes and supernovas. The HAWC is able to track where gamma rays originated, no matter how many light-years away.
Henry Romero/Reuters
This aerial view shows polluted water flowing from the Barra channel to the Barra beach, in Rio de Janeiro, Brazil, on March 23, 2015. Rio de Janeiros mayor acknowledged in a television interview Monday that the run-up to the 2016 games has proven a wasted opportunity to clean up the citys blighted waterways.
Felipe Dana/AP