Engine driver Josef Kowatsch (top L) steers a train through the NEAT Gotthard Base Tunnel during a media visit near the town of Erstfeld August 24, 2015. Crossing the Alps, the world's longest train tunnel should become operational at the end of 2016, consisting of two parallel single track tunnels, each of a length of 57 km (35 miles). (Photo by Arnd Wiegmann/Reuters)

A ceramic dog sleeps next to the gravesite of “Moses” at the Aspin Hill Memorial Park in Aspen Hill, Maryland August 25, 2015. Established in 1921, Aspin Hill contains the graves of more than 50,000 animals, from movies stars to WWI heroes to the dogs of former FBI Director J. Edgar Hoover. National Dog Day is celebrated in the United States on August 26. (Photo by Gary Cameron/Reuters)

Palestinian Anoush Belian poses on stage during a bodybuilding competition in Tel Aviv, Israel August 22, 2015. Belian, from Jerusalem, on Saturday became the first Palestinian female bodybuilder to participate and win an Israeli competition. Belian won the Miss Fitness category in the competition organised by the National Amateur Bodybuilders Association (NABBA) in Israel. (Photo by Ammar Awad/Reuters)

A customer shops at an Alibaba rural service centre in Jinjia Village, Tonglu, Zhejiang province, China, July 20, 2015. E-commerce growth in the countryside now outpaces that in major cities, though fewer than one tenth of online purchases made on Alibaba platforms were shipped to rural areas in the first quarter of this year. Alibaba estimates the potential market at 460 billion yuan ($74 billion) by next year. (Photo by Aly Song/Reuters)

A woman (C) shops for an offering at the witch doctor's street in La Paz, July 31, 2015. According to Andean culture, the all the month of August is a time to give offerings to “Pachamama” to give thanks for their farms and health. The Aymaras use coca leaves, candies, animal fat, llama fetuses, some dried fruits, powdered minerals and alcohol during these rituals. (Photo by David Mercado/Reuters)

Firefighters attempt to put out a fire at an abandoned building with the protection of St. Louis City Police in St. Louis, Missouri August 19, 2015. Police fatally shot a black man they say pointed a gun at them, drawing angry crowds and recalling the racial tensions sparked by the killing of an unarmed African-American teen in nearby Ferguson, Missouri, just over a year ago. (Photo by Lawrence Bryant/Reuters)

A Fulton Hotshot lights a controlled burn on the so-called “Rough Fire” in the Sequoia National Forest, California, August 21, 2015. In California, suffering its worst drought on record, about 2,500 people were forced to flee Christian camps east of Fresno at Hume Lake as the so-called Rough Fire crossed Highway 180, officials said. (Photo by Max Whittaker/Reuters)

A sales woman of a fish shop shows king crabs to a customer and negotiates the price in Noryangjin Fish Market is seen on August 1, 2015 in Seoul, South Korea. Noryangjin Fish Market was established in 1927 as Gyeongseong Susan in Jung-gu near Seoul Station and moved to its current location in 1971. (Photo by Shin Woong-jae/The Washington Post)