Participants wearing masks during a hazy day at the Beijing International Marathon in front of Tiananmen Square, in Beijing, October 19, 2014. (Photo by Reuters/Stringer)

A Sadhu or a Hindu holy man offers prayers while sitting inside a circle of burning “Upale” (or dried cow dung cakes) on the occasion to mark the Basant or spring festival, on the banks of river Ganga in the northern Indian city of Allahabad January 24, 2015. Basant is celebrated mainly in the northern Indian states marking the start of the spring season. (Photo by Jitendra Prakash/Reuters)

Russia's President Vladimir Putin (L) reacts as he talks to Belarus' President Alexander Lukashenko before a meeting on resolving the Ukrainian crisis in Minsk, February 11, 2015. A document seen by Reuters at talks on the Ukraine crisis suggested the sides may agree to end fighting in eastern Ukraine with a ceasefire starting on February 14, the withdrawal of heavy weapons and the creation of a security zone. (Photo by Mykola Lazarenko/Reuters)

A life-size robot named “Mark 1”, built by product and graphic designer Ricky Ma, 42, is seen in Hong Kong, China March 31, 2016. Ma, a robot enthusiast, spent a year-and-a half and more than HK$400,000 ($51,000) to create the humanoid robot, which is modelled after a Hollywood star, to fulfil his childhood dream. The eyes of the robot include face and color tracking functions. (Photo by Bobby Yip/Reuters)

A child poses on the runway during a party hosted by Chasing Fireflies to introduce Gwen Stefani's Harajuku Lovers children's collection at Duff's Cakemix on September 24, 2015 in West Hollywood, California. (Photo by Frazer Harrison/Getty Images for Chasing Fireflies)

The sign above the door of restaurant and hotel “Am Paulusbogen” is partially submerged in the flooded centre of the Bavarian town of Passau, about 200 km (124 miles) north-east of Munich June 3, 2013. (Photo by Michaela Rehle/Reuters)

School children dressed in traditional attire eat breakfast before participating in a Republic day parade in Bangalore, India, Thursday, January 26, 2017. (Photo by Aijaz Rahi/AP Photo)

A model presents makeup creations during dress reharsal by Maybelline New York at the Berlin Fashion Week Autumn/Winter 2015 in Berlin January 19, 2015. (Photo by Fabrizio Bensch/Reuters)