A group of young men use a selfie stick to take a picture of themselves in shallow waters known as the first cataract of the River Nile outside Khartoum, Sudan, May 22, 2015. In Sudan, which faces insurgences in the western region of Darfur and along its border with breakaway South Sudan, as well as double-digit inflation and high unemployment, life goes on for young people in the capital Khartoum. (Photo by Mohamed Nureldin Abdallah/Reuters)

Devotees bow to a passingTibetan Buddhist monk on his way to take part in a special prayer during Monlam or the Great Prayer rituals on March 5, 2015 at the Labrang Monastery, Xiahe County, Amdo, Tibetan Autonomous Prefecture, Gansu Province, China. Labrang Monastery is one of the six great monasteries of the Gelug school of Tibetan Buddhism and one of the largest outside of the Tibetan Autonomous Region. Monlam, the most important prayer event for many Tibetans was banned during the Cultural Revolution in China but once again in recent years it is celebrated in many areas. (Photo by Kevin Frayer/Getty Images)

Sophie and Sarah, old English sheepdogs, watch the sea from their plastic chairs. Amateur photographer Cees Bol, from the Netherlands, documents the lives of his beloved pooches Sophie and Sarah by taking pictures of them every day. (Photo by Cees Bol/Caters News Agency/Mercury Press)

An F/A-18 Hornet assigned to Strike Fighter Squadron One Five One (VFA-151) emerges from a cloud created when it broke the sound barrier in the skies over the Pacific Ocean, July 7, 1999. (Photo by John Gay/US Navy)

Tracy Sarita celebrates the sunrise during the Burning Man 2015 “Carnival of Mirrors” arts and music festival in the Black Rock Desert of Nevada, September 3, 2015. Approximately 70,000 people from all over the world are gathering at the sold-out festival to spend a week in the remote desert to experience art, music and the unique community that develops. (Photo by Jim Urquhart/Reuters)

Mud Madness at the annual Jaffa Cakes charity three-mile run at Foymore Lodge near Portadown this afternoon, on April 13, 2014. A total of a thousand competitors and fun-runners took part in the two races held over the mudstrewn endurance course. (Photo by Alan Lewis/Photopress Belfast)

A participant prepares for the Red Bull Air Race World Championships in Abu Dhabi, United Arab Emirates on February 6, 2017. (Photo by Red Bull Content Pool/SIPA Press/Rex Features/Shutterstock)

Azat Shajbyrov reacts with a baby falcon on his head in a village of Bokonbaevo, Issyk-Kul area (270 km from Bishkek), Kyrgyzstan, 22 June 2016, as he dreams of continuing a family tradition of golden eagle hunting. Eagle and falcon hunting is an old Kyrgyz tradition. With their birds, Kyrgyz berkutchy hunt in the mountains and participate in the hunting festival “Salburun”. (Photo by Igor Kovalenko/EPA)