A worker distributes electronic waste at a government managed recycling centre at the township of Guiyu in China's southern Guangdong province June 10, 2015. The town of Guiyu in the economic powerhouse of Guangdong province in China has long been known as one of the world’s largest electronic waste dump sites. At its peak, some 5,000 workshops in the village recycle 15,000 tonnes of waste daily including hard drives, mobile phones, computer screens and computers shipped in from across the world. (Photo by Tyrone Siu/Reuters)

A smokejumper leaps from an airplane during a training flight above Winthrop, Washington, U.S., June 30, 2016. On a 100-degree day in early June, eight experienced firefighters did sit-ups in a semicircle training to parachute into a wildfire. Better known as “rookie candidates”, they were determined to make it through the five-week program at North Cascades Smokejumper Base in Winthrop, Washington, where the first experimental jumps occurred in 1939. (Photo by David Ryder/Reuters)

A woman waits at a polio immunisation health centre, in Maiduguri, Borno State, Nigeria, August 29, 2016. Nigeria's military has liberated large swathes of land from Boko Haram but a ride with an army convoy, all guns firing for fear of ambush, shows how far the northeast is from normality after a brutal Islamist insurgency that has displaced millions. (Photo by Afolabi Sotunde/Reuters)

A man dressed as a Santa Claus poses at the front of the Kollhoff Tower at Potsdamer Platz square in Berlin December 14, 2014. (Photo by Hannibal Hanschke/Reuters)

A devotee takes a holy bath at the Balaju Baise Dhara (22 water spouts) during the Baishak Asnan festival in Kathmandu April 4, 2015. Devotees believe that the water from these stone spouts, which is collected from the catchment area of the Nagarjun forest behind the spouts, will cure pains and skin diseases. (Photo by Navesh Chitrakar/Reuters)

A prototype battery-powered plane, called Greased Lightning or GL-10 is pictured flying at NASA's Langley Research Center in this undated handout photo obtained by Reuters May 1, 2015. The plane, which has 10 engines and can take off like a helicopter and fly efficiently like an aircraft, is currently in the design and testing phase. (Photo by Reuters/NASA)

A Russian prisoner eating bread. (Photo by Hulton Archive/Getty Images). Finland, circa 1940

A woman buys bread at a bakery in Cairo, January 8, 2015. The successful roll-out so far of a new “smart card” system to distribute subsidised bread has been a major achievement for Egypt's government, saving money while earning praise from families who no longer have to wake early to fight for loaves. (Photo by Mohamed Abd El Ghany/Reuters)