A man looks out of the window of a train running between Aranyaprathet and Bangkok, Thailand, Monday, Nov. 25, 2013.

A man looks out of the window of a train running between Aranyaprathet and Bangkok, Thailand, Monday, Nov. 25, 2013.

 A child has his picture taken by his father on Brighton Pier, Brighton, England, Monday, April 20, 2009.

A child has his picture taken by his father on Brighton Pier, Brighton, England, Monday, April 20, 2009.

 A Darfuri woman holds a baby following rehearsals for independence celebrations in Juba, southern Sudan, Tuesday, July 5, 2011. Southern Sudan is set to declare independence from the north on Saturday, July 9. 

A Darfuri woman holds a baby following rehearsals for independence celebrations in Juba, southern Sudan, Tuesday, July 5, 2011. Southern Sudan is set to declare independence from the north on Saturday, July 9. 

 A woman calling for passengers on a bus smiles as she poses for a photograph in Manzhouli, Inner Mongolia, China, Saturday, March 21, 2009.

A woman calling for passengers on a bus smiles as she poses for a photograph in Manzhouli, Inner Mongolia, China, Saturday, March 21, 2009.

 Russian men make use of telephones in a shop offering cheap calling rates in Manzhouli, Inner Mongolia, China, Friday, March 20, 2009.

Russian men make use of telephones in a shop offering cheap calling rates in Manzhouli, Inner Mongolia, China, Friday, March 20, 2009.

 Dominican Day Parade, New York City, Aug. 2003.

Dominican Day Parade, New York City, Aug. 2003.

 An auto-rickshaw drive smiles as he negotiates evening traffic during the Commonwealth Games in New Delhi, India, Wednesday, Oct. 6, 2010.

An auto-rickshaw drive smiles as he negotiates evening traffic during the Commonwealth Games in New Delhi, India, Wednesday, Oct. 6, 2010.

 A man navigates his pedal-powered boat on a canal outside the Palazzo del Casino during the 71st edition of the Venice Film Festival in Venice, Italy, Saturday, Aug. 30, 2014.

A man navigates his pedal-powered boat on a canal outside the Palazzo del Casino during the 71st edition of the Venice Film Festival in Venice, Italy, Saturday, Aug. 30, 2014.

 A woman participating in the Fallas, a traditional celebration held in commemoration of Saint Joseph, sits on the ground in Valencia, Spain, Thursday, March 18, 2010.

A woman participating in the Fallas, a traditional celebration held in commemoration of Saint Joseph, sits on the ground in Valencia, Spain, Thursday, March 18, 2010.

 A woman uses a tablet to photograph shafts of light piercing the night sky at an installation entitled "Spectra" by Japanese artist Ryoji Ikeda next to the Houses of Parliament, London, Tuesday, Aug. 5, 2014.

A woman uses a tablet to photograph shafts of light piercing the night sky at an installation entitled "Spectra" by Japanese artist Ryoji Ikeda next to the Houses of Parliament, London, Tuesday, Aug. 5, 2014.

 Pedestrians walk past recently opened office blocks near King's Cross railway station, London, Wednesday, Dec. 10, 2014.

Pedestrians walk past recently opened office blocks near King's Cross railway station, London, Wednesday, Dec. 10, 2014.

 Railway points operators laugh as they smoke cigarettes after lunch in their hut inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.

Railway points operators laugh as they smoke cigarettes after lunch in their hut inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.

 Workers use steam to clear ice from a locomotive inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.

Workers use steam to clear ice from a locomotive inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.

 People gather around a food stall in Jemaa el Fna, Marrakesh, Morocco, Monday, March 12, 2007.

People gather around a food stall in Jemaa el Fna, Marrakesh, Morocco, Monday, March 12, 2007.

 An elderly man feeds birds in Regents Park, London, Wednesday, Feb. 11, 2009.

An elderly man feeds birds in Regents Park, London, Wednesday, Feb. 11, 2009.

 India's Central Industrial Security Force soldiers wearing protective shoe covers, guard outside the Taj Mahal mausoleum in Agra, India, Monday, Oct. 18, 2010. Shoes are not allowed in the Taj Mahal, as they wear down the marble. 

India's Central Industrial Security Force soldiers wearing protective shoe covers, guard outside the Taj Mahal mausoleum in Agra, India, Monday, Oct. 18, 2010. Shoes are not allowed in the Taj Mahal, as they wear down the marble. 

 Women from the Bari community laugh after performing a traditional dance during celebrations on the eve of southern Sudan's declaration of independence in Juba, southern Sudan, Friday, July 8, 2011.

Women from the Bari community laugh after performing a traditional dance during celebrations on the eve of southern Sudan's declaration of independence in Juba, southern Sudan, Friday, July 8, 2011.

 A man embraces his child at a soccer fan zone to watch Spain face Switzerland in a World Cup group match in Pretoria, South Africa, Wednesday, June 16, 2010.

A man embraces his child at a soccer fan zone to watch Spain face Switzerland in a World Cup group match in Pretoria, South Africa, Wednesday, June 16, 2010.

 Soccer fans blow their vuvuzelas in downtown Pretoria, South Africa, Wednesday, June 16, 2010.

Soccer fans blow their vuvuzelas in downtown Pretoria, South Africa, Wednesday, June 16, 2010.

 Passengers ride aboard a train between Agra and New Delhi, India, Monday, Oct. 18, 2010.

Passengers ride aboard a train between Agra and New Delhi, India, Monday, Oct. 18, 2010.

 Members of the Serpentine swimming club line up for the traditional Christmas day swimming race in Hyde Park's Serpentine Lake, London, Tuesday, Dec. 25, 2007.

Members of the Serpentine swimming club line up for the traditional Christmas day swimming race in Hyde Park's Serpentine Lake, London, Tuesday, Dec. 25, 2007.

 Pedestrians are illuminated by light reflecting from a nearby building on a crisp winter day as they walk past trees denuded of their leaves in central London, Sunday, Jan. 15, 2012.

Pedestrians are illuminated by light reflecting from a nearby building on a crisp winter day as they walk past trees denuded of their leaves in central London, Sunday, Jan. 15, 2012.

 A man inspects a pigeon handed to him by a street vendor on a road near the Jama Masjid mosque in New Delhi, India, Sunday, March 27, 2011.

A man inspects a pigeon handed to him by a street vendor on a road near the Jama Masjid mosque in New Delhi, India, Sunday, March 27, 2011.

 A family sit on the grass as the sun sets near Rashtrapati Bhawan, the Presidential Palace, New Delhi, Monday, March 21, 2011.

A family sit on the grass as the sun sets near Rashtrapati Bhawan, the Presidential Palace, New Delhi, Monday, March 21, 2011.

 Pedestrians are reflected in a puddle as they walk underneath the Eiffel Tower in Paris, Thursday, July 15, 2006. 

Pedestrians are reflected in a puddle as they walk underneath the Eiffel Tower in Paris, Thursday, July 15, 2006. 

 Towns and villages emit light visible through a layer of cloud covering the Lake Geneva region as the Mont Blanc massif is visible in background at center right, as seen from 1,528 meters (5,013 feet) above sea level at La Barillette in the Jura mountains, western Switzerland, Thursday, Nov. 15, 2012.

Towns and villages emit light visible through a layer of cloud covering the Lake Geneva region as the Mont Blanc massif is visible in background at center right, as seen from 1,528 meters (5,013 feet) above sea level at La Barillette in the Jura mountains, western Switzerland, Thursday, Nov. 15, 2012.

 A man looks out of the window of a train running between Aranyaprathet and Bangkok, Thailand, Monday, Nov. 25, 2013.
 A child has his picture taken by his father on Brighton Pier, Brighton, England, Monday, April 20, 2009.
 A Darfuri woman holds a baby following rehearsals for independence celebrations in Juba, southern Sudan, Tuesday, July 5, 2011. Southern Sudan is set to declare independence from the north on Saturday, July 9. 
 A woman calling for passengers on a bus smiles as she poses for a photograph in Manzhouli, Inner Mongolia, China, Saturday, March 21, 2009.
 Russian men make use of telephones in a shop offering cheap calling rates in Manzhouli, Inner Mongolia, China, Friday, March 20, 2009.
 Dominican Day Parade, New York City, Aug. 2003.
 An auto-rickshaw drive smiles as he negotiates evening traffic during the Commonwealth Games in New Delhi, India, Wednesday, Oct. 6, 2010.
 A man navigates his pedal-powered boat on a canal outside the Palazzo del Casino during the 71st edition of the Venice Film Festival in Venice, Italy, Saturday, Aug. 30, 2014.
 A woman participating in the Fallas, a traditional celebration held in commemoration of Saint Joseph, sits on the ground in Valencia, Spain, Thursday, March 18, 2010.
 A woman uses a tablet to photograph shafts of light piercing the night sky at an installation entitled "Spectra" by Japanese artist Ryoji Ikeda next to the Houses of Parliament, London, Tuesday, Aug. 5, 2014.
 Pedestrians walk past recently opened office blocks near King's Cross railway station, London, Wednesday, Dec. 10, 2014.
 Railway points operators laugh as they smoke cigarettes after lunch in their hut inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.
 Workers use steam to clear ice from a locomotive inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.
 People gather around a food stall in Jemaa el Fna, Marrakesh, Morocco, Monday, March 12, 2007.
 An elderly man feeds birds in Regents Park, London, Wednesday, Feb. 11, 2009.
 India's Central Industrial Security Force soldiers wearing protective shoe covers, guard outside the Taj Mahal mausoleum in Agra, India, Monday, Oct. 18, 2010. Shoes are not allowed in the Taj Mahal, as they wear down the marble. 
 Women from the Bari community laugh after performing a traditional dance during celebrations on the eve of southern Sudan's declaration of independence in Juba, southern Sudan, Friday, July 8, 2011.
 A man embraces his child at a soccer fan zone to watch Spain face Switzerland in a World Cup group match in Pretoria, South Africa, Wednesday, June 16, 2010.
 Soccer fans blow their vuvuzelas in downtown Pretoria, South Africa, Wednesday, June 16, 2010.
 Passengers ride aboard a train between Agra and New Delhi, India, Monday, Oct. 18, 2010.
 Members of the Serpentine swimming club line up for the traditional Christmas day swimming race in Hyde Park's Serpentine Lake, London, Tuesday, Dec. 25, 2007.
 Pedestrians are illuminated by light reflecting from a nearby building on a crisp winter day as they walk past trees denuded of their leaves in central London, Sunday, Jan. 15, 2012.
 A man inspects a pigeon handed to him by a street vendor on a road near the Jama Masjid mosque in New Delhi, India, Sunday, March 27, 2011.
 A family sit on the grass as the sun sets near Rashtrapati Bhawan, the Presidential Palace, New Delhi, Monday, March 21, 2011.
 Pedestrians are reflected in a puddle as they walk underneath the Eiffel Tower in Paris, Thursday, July 15, 2006. 
 Towns and villages emit light visible through a layer of cloud covering the Lake Geneva region as the Mont Blanc massif is visible in background at center right, as seen from 1,528 meters (5,013 feet) above sea level at La Barillette in the Jura mountains, western Switzerland, Thursday, Nov. 15, 2012.

A man looks out of the window of a train running between Aranyaprathet and Bangkok, Thailand, Monday, Nov. 25, 2013.

A child has his picture taken by his father on Brighton Pier, Brighton, England, Monday, April 20, 2009.

A Darfuri woman holds a baby following rehearsals for independence celebrations in Juba, southern Sudan, Tuesday, July 5, 2011. Southern Sudan is set to declare independence from the north on Saturday, July 9. 

A woman calling for passengers on a bus smiles as she poses for a photograph in Manzhouli, Inner Mongolia, China, Saturday, March 21, 2009.

Russian men make use of telephones in a shop offering cheap calling rates in Manzhouli, Inner Mongolia, China, Friday, March 20, 2009.

Dominican Day Parade, New York City, Aug. 2003.

An auto-rickshaw drive smiles as he negotiates evening traffic during the Commonwealth Games in New Delhi, India, Wednesday, Oct. 6, 2010.

A man navigates his pedal-powered boat on a canal outside the Palazzo del Casino during the 71st edition of the Venice Film Festival in Venice, Italy, Saturday, Aug. 30, 2014.

A woman participating in the Fallas, a traditional celebration held in commemoration of Saint Joseph, sits on the ground in Valencia, Spain, Thursday, March 18, 2010.

A woman uses a tablet to photograph shafts of light piercing the night sky at an installation entitled "Spectra" by Japanese artist Ryoji Ikeda next to the Houses of Parliament, London, Tuesday, Aug. 5, 2014.

Pedestrians walk past recently opened office blocks near King's Cross railway station, London, Wednesday, Dec. 10, 2014.

Railway points operators laugh as they smoke cigarettes after lunch in their hut inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.

Workers use steam to clear ice from a locomotive inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.

People gather around a food stall in Jemaa el Fna, Marrakesh, Morocco, Monday, March 12, 2007.

An elderly man feeds birds in Regents Park, London, Wednesday, Feb. 11, 2009.

India's Central Industrial Security Force soldiers wearing protective shoe covers, guard outside the Taj Mahal mausoleum in Agra, India, Monday, Oct. 18, 2010. Shoes are not allowed in the Taj Mahal, as they wear down the marble. 

Women from the Bari community laugh after performing a traditional dance during celebrations on the eve of southern Sudan's declaration of independence in Juba, southern Sudan, Friday, July 8, 2011.

A man embraces his child at a soccer fan zone to watch Spain face Switzerland in a World Cup group match in Pretoria, South Africa, Wednesday, June 16, 2010.

Soccer fans blow their vuvuzelas in downtown Pretoria, South Africa, Wednesday, June 16, 2010.

Passengers ride aboard a train between Agra and New Delhi, India, Monday, Oct. 18, 2010.

Members of the Serpentine swimming club line up for the traditional Christmas day swimming race in Hyde Park's Serpentine Lake, London, Tuesday, Dec. 25, 2007.

Pedestrians are illuminated by light reflecting from a nearby building on a crisp winter day as they walk past trees denuded of their leaves in central London, Sunday, Jan. 15, 2012.

A man inspects a pigeon handed to him by a street vendor on a road near the Jama Masjid mosque in New Delhi, India, Sunday, March 27, 2011.

A family sit on the grass as the sun sets near Rashtrapati Bhawan, the Presidential Palace, New Delhi, Monday, March 21, 2011.

Pedestrians are reflected in a puddle as they walk underneath the Eiffel Tower in Paris, Thursday, July 15, 2006. 

Towns and villages emit light visible through a layer of cloud covering the Lake Geneva region as the Mont Blanc massif is visible in background at center right, as seen from 1,528 meters (5,013 feet) above sea level at La Barillette in the Jura mountains, western Switzerland, Thursday, Nov. 15, 2012.

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