Usain Bolt of Jamaica sits on a bench with Justin Gatlin of U.S. after the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing...Usain Bolt of Jamaica (L) sits on a bench with Justin Gatlin of U.S. after the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. Bolt finished in first place and Gatlin in second place

Kai Pfaffenbach/Reuters

Usain Bolt of Jamaica sits on a bench with Justin Gatlin of U.S. after the men’s 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China on Thursday. Bolt finished in first place and Gatlin in second place

A spider is silhouetted against a string of lights in Overland Park, Kansas.

Charlie Riedel/AP

A Syrian migrant carries children as he walks along railway track to cross Serbian border with Hungary near the village of Horgos...A Syrian migrant carries his children as he walks along a railway track to cross the Serbian border with Hungary near the village of Horgos August 27, 2015. Hungary made plans on Wednesday to reinforce its southern border with helicopters, mounted police and dogs, and was also considering using the army as record numbers of migrants, many of them Syrian refugees, passed through coils of razor-wire into Europe

Marko Djurica/Reuters

A Syrian migrant carries his children as he walks along a railway track to cross the Serbian border with Hungary near the village of Horgos on Thursday

Summer weather Aug 27th 2015...A faint Aurora can be seen over Bamburgh lighthouse in Northumberland the early hours of this morning. PRESS ASSOCIATION Photo. Picture date: Thursday August 27, 2015

Owen Humphreys/PA

A faint Aurora can be seen over Bamburgh lighthouse in Northumberland the early hours of this morning

A paramilitary police officer in plain-clothes holding an umbrella keeps watch on Beijing's Tiananmen Square, on Thursday. Major Western leaders will not attend a military parade in China next week to mark the end of World War Two, leaving President Xi Jinping to stand with leaders and officials from Russia, Sudan, Venezuela and North Korea at his highest-profile event of 2015

Jason Lee/Reuters

A paramilitary police officer in plain-clothes holding an umbrella keeps watch on Beijing’s Tiananmen Square, on Thursday

A boy looks through the window grills of a house that was damaged by a Saudi-led air strike in Yemen's capital Sanaa...A boy looks through the window grills of a house that was damaged by a Saudi-led air strike in Yemen's capital Sanaa August 26, 2015. Yemeni army units allied to the Houthi militia fired a ballistic missile toward southern Saudi Arabia on Wednesday, the group's TV channel said, as combat between the kingdom and the Iran-allied group has intensified. REUTERS/Khaled Abdullah

Khaled Abdullah/Reuters

A boy looks through the window grills of a house that was damaged by a Saudi-led air strike in Yemen‘s capital Sanaa. Yemeni army units allied to the Houthi militia fired a ballistic missile toward southern Saudi Arabia on Wednesday, the group’s TV channel said, as combat between the kingdom and the Iran-allied group has intensified. 

Thai veterinarians and wildlife officers collect blood sample during a health examination at Kao Pratubchang Conservation Centre in Ratchaburi...Thai veterinarians and wildlife officers collect blood sample during a health examination at Kao Pratubchang Conservation Centre in Ratchaburi, Thailand, August 27, 2015. Thai veterinarians from the Department of National Park Wildlife, and Plant Conservation conducted a health check of 14 orangutans for preparation for the repatriation to their country of origin, Indonesia. Most of Sumatran and Borneo Kalimantan orangutans, were confiscated from entertainment businesses in Phuket province since 2008. Authorities said the orangutans are being examined to ensure they are free from diseases such as Rabies, Foot and Mouth disease, Tuberculosis, Hepatitis and Herpes. Thai officials said the orangutans are expected to return to Indonesia in September. REUTERS/Athit Perawongmetha

Athit Perawongmetha/Reuters

Thai veterinarians and wildlife officers collect blood sample during a health examination at Kao Pratubchang Conservation Centre in Ratchaburi, Thailand. Thai veterinarians from the Department of National Park Wildlife, and Plant Conservation conducted a health check of 14 orangutans for preparation for the repatriation to their country of origin, Indonesia. Authorities said the orangutans are being examined to ensure they are free from diseases such as Rabies, Foot and Mouth disease, Tuberculosis, Hepatitis and Herpes. Thai officials said the orangutans are expected to return to Indonesia in September

Johnson-Thompson of Britain competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing

Phil Noble/Reuters

Katarina Johnson-Thompson of Britain competes in the women’s long jump qualifying round during the 15th IAAF World Championships at the Bird’s Nest National Stadium in Beijing, China, on Thursday.

Migrants from Syria sleep at a park in Belgrade, Serbia

Marko Drobnjakovic/AP

Migrants from Syria sleep at a park in Belgrade, Serbia. Over 10,000 migrants, including many women with babies and small children, have crossed into Serbia over the past few days and headed toward Hungary and the EU Schengen Area, a zone with no internal border checks between member countries.

Indian women perform rituals on the banks of the Godavari River at Kumbh Mela, or Pitcher Festival, in Nasik, India, Thursday, Aug. 27, 2015. Thousands of devout Hindus began splashing into the west Indian river at one of the country's largest festivals. (AP Photo/Tsering Topgyal)

Tsering Topgyal/AP

Indian women perform rituals on the banks of the Godavari River at Kumbh Mela in Nasik, India, Thursday Thousands of devout Hindus began splashing into the west Indian river at one of the country’s largest festivals 

A young Yemeni holds an automatic weapon stands near effigies depicting the victims of the ongoing conflict during a rally against the military offensive carried out by the Saudi-led coalition, in Sanaa, Yemen

Yahya Arhab/EPA

A young Yemeni holds an automatic weapon stands near effigies depicting the victims of the ongoing conflict during a rally against the military offensive carried out by the Saudi-led coalition, in Sanaa, Yemen

The World's Biggest Tomato Fight At Tomatina Festival...BUNOL, SPAIN - AUGUST 26:  Revellers enjoy the atmosphere in tomato pulp while participating the annual Tomatina festival on August 26, 2015 in Bunol, Spain. An estimated 22,000 people threw 150 tons of ripe tomatoes in the world's biggest tomato fight held annually in this Spanish Mediterranean town.

David Ramos/Getty Images

Revellers enjoy the atmosphere in tomato pulp while participating the annual Tomatina festival on Wednesday in Bunol, Spain

Families of Palestinians who were abduct...Families of Palestinians who were abducted of by gunmen is Egypt's Sinai's northern region, take part in a demonstration calling for the release at the Rafah border crossing with Egyptp in the southern Gaza Strip, on August 26, 2015. Gunmen in Egypt boarded a bus carrying Palestinians from Cairo to Gaza and seized four of the passengers before letting the others continue, Hamas officials in the strip said

Said Khatib/AFP

Families of Palestinians who were abducted by gunmen is Egypt’s Sinai’s northern region, take part in a demonstration calling for their release at the Rafah border crossing with Egypt in the southern Gaza Strip, on Wednesday

A boy pushes his bicycle loaded with a bucket across a dirt track next to people carrying their belongings, across to Colombia through the Tachira river at San Antonio in Tachira state, Venezuela...A boy pushes his bicycle loaded with a bucket across a dirt track next to people carrying their belongings, across to Colombia through the Tachira river at San Antonio in Tachira state, Venezuela

Carlos Garcia Rawlins/Reuters

A boy pushes his bicycle loaded with a bucket across a dirt track next to people carrying their belongings, across to Colombia through the Tachira river at San Antonio in Tachira state, Venezuela

Syrian migrants cross under a fence at Hungarian-Serbian border near Roszke

Laszlo Balogh/Reuters

Syrian migrants cross under a fence into Hungary at the border with Serbia, near Roszke, on Wednesday. Hungary’s government has started to construct a 175-km-long (110-mile-long) fence on its border with Serbia in order to halt a massive flow of migrants who enter the EU via Hungary and head to western Europe.

An investor looks at an electronic board showing stock information of Shanghai Stock Exchange Composite Index at a brokerage house in Beijing, August 26, 2015. Asian shares struggled on Wednesday as investors feared fresh rate cuts in China would not be enough to stabilise its slowing economy or halt a stock collapse that is wreaking havoc in global markets

Jason Lee/Reuters

An investor looks at an electronic board showing stock information of Shanghai Stock Exchange Composite Index at a brokerage house in Beijing. Asian shares struggled on Wednesday as investors feared fresh rate cuts in China would not be enough to stabilise its slowing economy or halt a stock collapse that is wreaking havoc in global markets

Rick Yen is silhouetted as he casts a rod while fishing for salmon near the mouth of the Capilano River off Ambleside Park at sunset in West Vancouver, British Columbia, Tuesday, Aug. 25, 2015. (Darryl Dyck/The Canadian Press via AP) MANDATORY CREDIT

Darryl Dyck/The Canadian Press/AP

Rick Yen is silhouetted as he casts a rod while fishing for salmon near the mouth of the Capilano River off Ambleside Park at sunset in West Vancouver British Columbia

Athletes compete during their men's 110 metres hurdles heat at the IAAF World Championships at the National Stadium in Beijing...(L-R) Aleec Harris of the U.S., Nicholas Hough of Australia, Matthias Buhler of Germany and Ben Reynolds of Ireland compete during their men's 110 metres hurdles heat at the IAAF World Championships at the National Stadium in Beijing, China August 26, 2015. REUTERS/Pawel Kopczynski

Pawel Kopczynski/Reuters

Athletes compete during their men’s 110 metres hurdles heat at the IAAF World Championships at the National Stadium in Beijing, Aleec Harris of the U.S., Nicholas Hough of Australia, Matthias Buhler of Germany and Ben Reynolds of Ireland compete during their men’s 110 metres hurdles heat at the IAAF World Championships at the National Stadium in Beijing, China 

German Chancellor Angela Merkel (R) pres...German Chancellor Angela Merkel (R) presents a bouquet of flowers to German Agriculture Minister Christian Schmidt for his birthday during a weekly meeting of the German cabinet at the Chancellery in Berlin on August 26, 2015.    AFP PHOTO / JOHN MACDOUGALLJOHN MACDOUGALL/AFP/Getty Images

John Macdougall/AFP/Getty Images

German Chancellor Angela Merkel presents a bouquet of flowers to German Agriculture Minister Christian Schmidt for his birthday during a weekly meeting of the German cabinet at the Chancellery in Berlin 

Hindu devotees take holy dip in the River Godavari on the first official day of bathing as part of Kumbh Mela celebrations in Nasik, India, Wednesday, Aug. 26, 2015. Hindus believe that sins accumulated in past and current lives require them to continue the cycle of death and rebirth until they are cleansed. Bathing in sacred waters on the most auspicious day of the Kumbh festival, or Pitcher Festival, believers say rids them of their sins. (AP Photo/Bernat Armangue)

Bernat Armangue/AP

Hindu devotees take holy dip in the River Godavari on the first official day of bathing as part of Kumbh Mela celebrations in Nasik, India