This photo taken on august 11, 2014 shows a US soldier, part of the NATO-led International Security Assistance Force (ISAF), manning a machine gun onboard a Chinook helicopter over the Gardez district of Paktia province. All NATO combat troops will be out of Afghanistan by the end of the year, though some US special forces are set to stay on to conduct discreet strikes against Al-Qaeda remanents. (Photo by Shah Marai/AFP Photo)

A visitor enjoys a drink at the Great British Beer Festival on silly hat day, at Olympia, London, on August 14, 2014. (Photo by Justin Tallis/PA Wire)

People look at a replica of Chinese aircraft carrier “Liaoning” made of toy building blocks, on display at a shopping mall in Shenyang, Liaoning province August 10, 2014. The replica, which measures 9-metres-long, 1.78-metres-wide and 1.6-metres-high, was made using a total of 443,800 pieces of toy blocks and took six people 180 days to finish, local media reported. (Photo by Reuters/Stringer)

Musashino Art University student Kana Ogawara displays body paintings by Hikaru Cho on her hands at an art event in Tokyo, Sunday, August 10, 2014. (Photo by Shizuo Kambayashi/AP Photo)

A tourist (C) poses for pictures as she reacts after getting biten by a royal horse guard at the National Palace in Kuala Lumpur on August 14, 2014. Malaysia is a constitutional monarchy with an elected monarch as head of state every five years. (Photo by Mohd Rasfan/AFP Photo)

The supermoon rises through the clouds behind the “Motherland” statue, part of the WWII memorial complex, in Kiev, Ukraine, Sunday, August 10, 2014. The phenomenon, which scientists call a “perigee moon”, occurs when the moon is near the horizon and appears larger and brighter than other full moons. (Photo by Osman Karimov/AP Photo)

A Tengger tribesman prays at Mount Bromo during the annual Kasada ceremony in East Java on August 12, 2014. The Kasada ceremony is a festival held every 14th day of the Kasada month in the traditional Hindu lunar calender to honour Sang Hyang Widhi (God Almighty) and is based on the legend of Roro Anteng and Joko Seger from the Majapahit Kingdom, from which their Tengger tribe name originates. Hundreds of worshippers from the Tengger tribe offer food and livestock as a symbolic sacrifice which they throw into the crater for the blessings of safety and prosperity to their familyies and community. (Photo by Juni Kriswanto/AFP Photo)

A 1938 Mercedes-Benz 540k Streamliner, from the Mercedes-Benz classic collection, rolls past Sobranes Point in Big Sur, Calif., Thursday, August 14, 2014, during the 2014 Pebble Beach Tour D'Elegance. During the event vehicles traveled from Pebble Beach to Laguna Seca Raceway, down the coast to Big Sur and back to Carmel. (Photo by David Royal/AP Photo/Monterey Herald)

A woman with painted face takes part in the Mermaid festival in city of Braslav, some 270 km from Minsk on August 8, 2014. (Photo by Maksim Malinovsky/AFP Photo)

Sviatlana Kudzelich of Belarus (2nd L) Natalya Vlasova of Russia (L) and Gesa-Felicitas Krause of Germany (4th L) clear a water obstacle in a women's 3000 metres steeplechase heat during the European Athletics Championships at the Letzigrund Stadium in Zurich August 15, 2014. (Photo by Phil Noble/Reuters)

In this photo taken Tuesday, August 12, 2014, flying trapeze instructors teaches techniques to students during their first day of practice at the Flying Trapeze Philippines School in suburban Makati, south of Manila, Philippines. The new facility teaches students basic techniques from taking off a platform as high as a three-story building, hanging on to the swinging trapeze bar with your hands or back of knees and landing on the safety net below said owner William Hsu. The sport has been gaining adherents, he said, with more than 150 such schools worldwide. (Photo by Aaron Favila/AP Photo)

Semi-nude Indian Samajwadi Party student union workers stop a train near Allahabad Junction during a protest against central government in Allahabad on August 11, 2014. The protestors demanded the scrapping of CSAT format in Union Public Service Commission (UPSC) exams. (Photo by Sanjay Kanojia/AFP Photo)

Undated handout photo issued by Harvard University of a close up of a Kilobot swarm, obedient miniature robots that act together as a “swarm” to form a 1,000-strong army, scientists in the US created the soldier-like devices, each measuring a few centimetres across, to demonstrate how simple machines can display complex self-organising behaviour. (Photo by Michael Rubenstein/PA Wire/Harvard University)

A couple walks on a major highway in front of containers placed to block roads in Islamabad August 13, 2014. Thousands of riot police sealed off Pakistan's capital with barbed wire and shipping containers on the eve of the country's Independence Day, in a bid to foil mass protests aimed at toppling embattled Prime Minister Nawaz Sharif. (Photo by Faisal Mahmood/Reuters)

School students hold a 200-meter-long Indian national flag during India's Independence Day celebrations in the southern Indian city of Chennai August 13, 2014. India commemorates its Independence Day on August 15. (Photo by Reuters/Babu)

This photo taken on August 8, 2014 shows a replica of a rocket-powered kamikaze attack plane “Oka”, (“Cherry Blossom”), displayed at a park beside the former Imperial Navy air base in Kashima, Ibaraki prefecture, where Oka pilots trained. The six-metre (20-foot) aircraft were more like flying bombs, powered by short-lasting engines that would run just long enough to send them spiralling into enemy ships. (Photo by Toshifumi Kitamura/AFP Photo)

The moon rises in the sky as seen through the Four Towers or C.T.B.A. (Cuatro Torres Business Area), one of the main symbols of Madrid, Spain, Monday, August 11, 2014. (Photo by Daniel Ochoa de Olza/AP Photo)

An Afghan confectionery worker makes traditional sweets at a factory on the outskirts of Jalalabad in Nangarhar province on August 11, 2014. Afghanistan's economy has improved significantly since the fall of the Taliban regime in 2001 largely because of the infusion of international assistance. Despite significant improvement in the last decade the country is still extremely poor and remains highly dependent on foreign aid. (Photo by Noorullah Shirzada/AFP Photo)

Fireworks illuminate the sky in the bay of Geneva, during the Geneva Festival, in Geneva, Switzerland, Saturday, late August 9, 2014. (Photo by Salvatore Di Nolfi/AP Photo/Keystone)

A trapped worker calls for help from the rubble of a collapsed building in Pathumthani province, central Thailand, Monday, August 11, 2014. A six-story building under construction on the outskirts of Thailand's capital collapsed Monday, killing a number of workers and trapping several others underneath the rubble, police said. (Photo by AP Photo)

A participant of the Splashdiving World Championship wears a unicorn mask as he jumps into the Freizeitbad Silvana public swimming pool in Schweinfurt, southern Germany, on August 9, 2014. Around 50 participants try to find out until August 10, 2014 who is the “master of the cannonball”. (Photo by Karl-Josef Hildenbrand/AFP Photo/DPA)

People wait for the bus in a flooded bus stop during heavy rain in Minsk, on August 12, 2014. (Photo by Sergei Gapon/AFP Photo)

In this photo taken Thursday, August 14, 2014, a Ukrainian soldier sits atop of a self-propelled gun as an army column of military vehicles prepares to roll to a frontline near Illovaisk, Donetsk region, eastern Ukraine. Ukrainian forces have stepped up efforts to dislodge the separatists from their last strongholds in Donetsk and Luhansk and there was more heavy shelling overnight. (Photo by Evgeniy Maloletka/AP Photo)

A man leaves a store on Sunday, August 10, 2014, in Ferguson, Mo. A few thousand people crammed a suburban St. Louis street Sunday night at a vigil for unarmed 18-year-old Michael Brown shot and killed by a police officer, while afterward several car windows were smashed and stores were looted as people carried away armloads of goods as witnessed by an an Associated Press reporter. (Photo by David Carson/AP Photo/St. Louis Post-Dispatch)

A worker lines up the mount as a space shuttle replica is lifted into place atop the Shuttle Carrier Aircraft (SCA) Thursday morning, August 14, 2014, at NASA's Johnson Space Center in Houston. The old Boeing 747 formerly transported shuttles piggyback to Florida following flights. Visitors will be allowed to enter both vehicles when the permanent exhibit opens in 2015. (Photo by Kar B. Hlava/AP Photo/Conroe Courier)

Actor Mickey Rourke (L) wears a T-shirt with an image depicting Russia's President Vladimir Putin, as a woman looks on at GUM department store in central Moscow, August 11, 2014. Creators of the new T-shirt collection, which went on sale Monday after an earlier batch sold in June was well-received, produced the T-shirts displaying images of Russia's President Putin as they were inspired by triumphs of Russian sportsmen at the Sochi 2014 Olympics, the Paralympic Winter Games and the 2014 Men's Ice Hockey World Championship, as well as Russia's annexation of Crimea, according to local media. (Photo by Maxim Zmeyev/Reuters)

A massive, dramatic dust storm moves toward a barn near Harrington Wash., Tuesday August 12, 2014. More often associated with the Southwest the dust storm blew through Eastern Washington and north Idaho on Tuesday evening in advance of thunderstorms, lightning and rain. (Photo by Lacey Hirst/AP Photo)

View of a burnt truck on the road between Cucuta and Ocana, in Alto El Pozo, department of Norte de Santander, Colombia, on August 13, 2014. Authorities said five trucks were burnt on early Wednesday by alleged members of the National Liberation Army (ELN) guerrillas. (Photo by Javier Sarabia/AFP Photo/Diario La Opinión)

A man poses on a tricycle near the site during the Feast of the La Paloma Virgin in Madrid late August 15, 2014. (Photo by Javier Barbancho/Reuters)

A dancer performs during Independence Day celebrations in Gauhati, India, Friday August 15 2014. India celebrates its 1947 independence from British colonial rule on August 15. (Photo by Anupam Nath/AP Photo)