“The power of nature”. Magma, ash and gas erupt from Mount Etna in December 2015, rising to a height of several kilometres. Winner: Nature. (Photo by Giuseppe Mario Famiani/SIPA Contest)

Jourdan Dunn poses for photographers upon arrival at the MTV European Music Awards 2016 in Rotterdam, Netherlands, Sunday, November 6, 2016. (Photo by NIVIERE/SIPA Press/Rex Features/Shutterstock)

Bebe Rexha performs on stage at the 2016 MTV Europe Music Awards at the Ahoy Arena in Rotterdam, Netherlands, November 6, 2016. (Photo by Yves Herman/Reuters)

A leaflet denouncing South Korean President Park Geun-hye lies on the ground after it was torn at a protest calling Park to step down, in Seoul, South Korea, November 19, 2016. (Photo by Kim Hong-Ji/Reuters)

Dani (L) and Bella Thorne arrive at the 2016 American Music Awards in Los Angeles, California, U.S., November 20, 2016. (Photo by Danny Moloshok/Reuters)

Boys play with a ball in front of oilfields burned by Islamic State fighters in Qayyara, south of Mosul, Iraq November 23, 2016. (Photo by Goran Tomasevic/Reuters)

A policeman is pictured near a woman with a baby during an operation against drug dealers in Cidade de Deus or City of God slum in Rio de Janeiro, Brazil, November 23, 2016. (Photo by Ricardo Moraes/Reuters)

Competitors ride a home-made vehicle without an engine on a downhill track in the Red Bull Soapbox Race in Santiago, Chile, November 27, 2016. (Photo by Jonathan Faus/Reuters)