A donkey carrying sacks of coal walks through the narrow tunnels of a coal mine, in Choa Saidan Shah in Punjab province April 29, 2014. Coal miners in Chao Saidan Shah use donkeys to transport coal from the depths of the mines to the surface. The donkeys make around 20 trips per day carrying sacks weighing about 20 kg (44 lbs) each. The work is dangerous with the constant risk of cave-ins. The miners say they do what they can to care for the animals, with their limited resources, but the difficult conditions mean the donkeys' life expectancy is 12-13 years. May 8 is International Donkey Day, which The Donkey Sanctuary NGO says "aims to highlight the worthy contribution donkeys make throughout the world." Picture taken April 29, 2014. REUTERS/Sara Farid

Sarah Farid/Reuters

A donkey hauls coal through a mine in Punjab province, Pakistan. The donkeys make about 20 trips a day to the surface, carrying sacks weighing about 20kg each. The difficult conditions mean their life expectancy is 12-13 years, whereas those in prosperous countries live between 30 and 50 years.

arah Jessica Parker attends the "Charles James: Beyond Fashion" Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City.  (Photo by Larry Busacca/Getty Images)

Larry Busacca/Getty Images

Sarah Jessica Parker attends the “Charles James: Beyond Fashion” Costume Institute Gala at the Metropolitan Museum of Art, New York City.

France's newly appointed Prime minister Manuel Valls (L) speaks with French President Francois Hollande before the first cabinet meeting of his government, at the Elysee Palace in Paris, on April 4, 2014.

Fred Dufour/AFP

Manuel Valls (left), France’s newly appointed prime minister, meets President François Hollande before the first cabinet meeting of his government, at the Élysée Palace in Paris.

An Afghan boy carries election material on his back to polling stations which are not accessible by road in Shutul, Panjshir province, April 4, 2014. The Afghan presidential elections will be held on April 5.

Ahmad Masood/Reuters

A boy carries election material to polling stations inaccessible by road in Shutul, Panjshir province, Afghanistan. Presidential elections will be held on Saturday.

A worker attaches prayer petitions, with names written on cards, to lotus lanterns in preparation for the upcoming birthday of Buddha at Jogye temple in Seoul April 4, 2014. Buddha's birthday falls on May 6 in South Korea.   REUTERS/Kim Hong-Ji (SOUTH KOREA - Tags: SOCIETY RELIGION TPX IMAGES OF THE DAY)

Kim Hong-Ji/Reuters

A man attaches prayer petitions, with names written on cards, to lotus lanterns in preparation for the upcoming birthday of Buddha, at Jogye temple in Seoul. Buddha’s birthday falls on May 6 this year for countries in east Asia, except Japan. 

Pope Francis and President Barack Obama smile as they exchange gifts, at the Vatican Thursday, March 27, 2014. President Barack Obama called himself a "great admirer" of Pope Francis as he sat down at the Vatican Thursday with the pontiff he considers a kindred spirit on issues of economic inequality. Their historic first meeting comes as Obama's administration and the church remain deeply split on issues of abortion and contraception. (AP Photo/Gabriel Bouys,

Gabriel Bouys/AP

Pope Francis and US President Barack Obama exchange gifts at the Vatican on Thursday. It is their first meeting.

A Cossack guard stands in front of Crimea's regional parliament building in Simferopol on March 12, 2014. Pro-Moscow lawmakers in Crimea voted for independence from Ukraine on March 11 in a precursor to a referendum this weekend for the region to become part of Russia..  AFP PHOTO/ Filippo MONTEFORTEFILIPPO MONTEFORTE/AFP/Getty Images

Filippo Monteforte/AFP

A Cossack guard stands in front of Crimea’s regional parliament building in Simferopol

Damir Sagolj/Reuters

Damir Sagolj/Reuters

A man takes a nap in the departure hall of the Kuala Lumpur International airport, Malaysia

Muslim Palestinians take part in Friday noon prayers blocked by Israeli police in East Jerusalem neighborhood of Ras al-Amud, on February 28, 2014. Clashes broke out following Friday noon prayer three days after police clashed with stone-throwing Palestinians at the al-Aqsa mosque compound, hours ahead of a debate in the Israeli parliament on Jews' right to pray at the compound, which is currently denied. The flashpoint compound sits above the Western Wall plaza and houses the Dome of the Rock and the Al-Aqsa mosque, and is Islam's third-holiest site.  AFP PHOTO / AHMAD GHARABLIAHMAD GHARABLI/AFP/Getty Images

Ahmad Gharabli/AFP

Muslim Palestinians take part in Friday noon prayers blocked by Israeli police in the East Jerusalem neighbourhood of Ras al-Amud. Clashes broke out after police confronted stone-throwing Palestinians at the al-Aqsa mosque compound

Papier mache pandas, created by French artist Grangeon, are seen displayed outside Taipei City Hall as part of an exhibition called "Pandas on Tour"...Papier mache pandas, created by French artist Paulo Grangeon, are seen displayed outside Taipei City Hall as part of an exhibition called "Pandas on Tour", February 28, 2014. According to local media, the event was launched by the World Wildlife Fund (WWF) first in Paris in 2008. Approximately 1,600 panda sculptures were displayed in the exhibition to remind people of the similar number of giant pandas still living in the wild and call on people's protection of endangered species. REUTERS/Patrick Lin (TAIWAN - Tags: ANIMALS SOCIETY ENVIRONMENT)

Patrick Lin/Reuters

Papier mâché pandas created by French artist Grangeon are displayed outside Taipei City Hall as part of an exhibition called “Pandas on Tour”