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Pictures | Tue May 26, 2009 | 12:00pm EDT

Photo technique: monochrome

<p>A pedestrian is silhouetted at a business district in Tokyo February 16, 2009.  REUTERS/Kim Kyung-Hoon </p>

A pedestrian is silhouetted at a business district in Tokyo February 16, 2009. REUTERS/Kim Kyung-Hoon

A pedestrian is silhouetted at a business district in Tokyo February 16, 2009. REUTERS/Kim Kyung-Hoon

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<p>A paramilitary policeman stands amid thick fog at Tiananmen Square in Beijing, December 10, 2007. REUTERS/Reinhard Krause </p>

A paramilitary policeman stands amid thick fog at Tiananmen Square in Beijing, December 10, 2007. REUTERS/Reinhard Krause

A paramilitary policeman stands amid thick fog at Tiananmen Square in Beijing, December 10, 2007. REUTERS/Reinhard Krause

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<p>A couple are silhouetted in front of the Tower Bridge during foggy conditions in London December 23, 2007. 
REUTERS/Luke MacGregor </p>

A couple are silhouetted in front of the Tower Bridge during foggy conditions in London December 23, 2007. REUTERS/Luke MacGregor

A couple are silhouetted in front of the Tower Bridge during foggy conditions in London December 23, 2007. REUTERS/Luke MacGregor

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<p>People out for a late evening walk pass by a snow covered park bench in North Vancouver, during a winter storm December 30, 2003.  REUTERS/Andy Clark   </p>

People out for a late evening walk pass by a snow covered park bench in North Vancouver, during a winter storm December 30, 2003. REUTERS/Andy Clark

People out for a late evening walk pass by a snow covered park bench in North Vancouver, during a winter storm December 30, 2003. REUTERS/Andy Clark

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<p>Snow covered cars are parked in the car park of Simon car re-import company in Emmering westward of Munich December 12, 2008.   REUTERS/Michaela Rehle </p>

Snow covered cars are parked in the car park of Simon car re-import company in Emmering westward of Munich December 12, 2008. REUTERS/Michaela Rehle

Snow covered cars are parked in the car park of Simon car re-import company in Emmering westward of Munich December 12, 2008. REUTERS/Michaela Rehle

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<p>U.S. soldiers run after they release a smoke grenade during a joint patrol with Iraqi soldiers in Baquba June 25, 2007.  
REUTERS/Goran Tomasevic   </p>

U.S. soldiers run after they release a smoke grenade during a joint patrol with Iraqi soldiers in Baquba June 25, 2007. REUTERS/Goran Tomasevic

U.S. soldiers run after they release a smoke grenade during a joint patrol with Iraqi soldiers in Baquba June 25, 2007. REUTERS/Goran Tomasevic

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<p>A windsurfer gets airborne as the sun sets over Cape Town's Blaauwberg beach, February 23, 2004. REUTERS/Mike Hutchings </p>

A windsurfer gets airborne as the sun sets over Cape Town's Blaauwberg beach, February 23, 2004. REUTERS/Mike Hutchings

A windsurfer gets airborne as the sun sets over Cape Town's Blaauwberg beach, February 23, 2004. REUTERS/Mike Hutchings

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<p>A worker separates chicks into "Grade A" and "Grade B" categories where the latter is thrown into the funnel at the Wadi Hatcheries in Sadat City March 8, 2007.  REUTERS/Tara Todras-Whitehill </p>

A worker separates chicks into "Grade A" and "Grade B" categories where the latter is thrown into the funnel at the Wadi Hatcheries in Sadat City March 8, 2007. REUTERS/Tara Todras-Whitehill

A worker separates chicks into "Grade A" and "Grade B" categories where the latter is thrown into the funnel at the Wadi Hatcheries in Sadat City March 8, 2007. REUTERS/Tara Todras-Whitehill

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<p>A man walks through Berlin's public Tiergarten park on a sunny autumn day November 16, 2006.  REUTERS/Arnd Wiegmann    </p>

A man walks through Berlin's public Tiergarten park on a sunny autumn day November 16, 2006. REUTERS/Arnd Wiegmann

A man walks through Berlin's public Tiergarten park on a sunny autumn day November 16, 2006. REUTERS/Arnd Wiegmann

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<p>The coastline of Big Sur is partially obscured by smoke from a massive wildfire in Big Sur, California July 3, 2008.  REUTERS/Robert Galbraith </p>

The coastline of Big Sur is partially obscured by smoke from a massive wildfire in Big Sur, California July 3, 2008. REUTERS/Robert Galbraith

The coastline of Big Sur is partially obscured by smoke from a massive wildfire in Big Sur, California July 3, 2008. REUTERS/Robert Galbraith

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<p>A Chinese boy runs through a field in the countryside of Jinzhai county in China's central province of Anhui in this picture taken July 13, 2004. REUTERS/Wilson Chu  </p>

A Chinese boy runs through a field in the countryside of Jinzhai county in China's central province of Anhui in this picture taken July 13, 2004. REUTERS/Wilson Chu

A Chinese boy runs through a field in the countryside of Jinzhai county in China's central province of Anhui in this picture taken July 13, 2004. REUTERS/Wilson Chu

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<p>A turtle keeps cool in a pool in an Athens zoo June 26, 2007 as temperatures soared to 46 degrees Celsius (114.8 Fahrenheit) in parts of southeast Europe. Greece, which has seen some of the highest temperatures, is set to record its hottest ever June.  REUTERS/Yannis Behrakis </p>

A turtle keeps cool in a pool in an Athens zoo June 26, 2007 as temperatures soared to 46 degrees Celsius (114.8 Fahrenheit) in parts of southeast Europe. Greece, which has seen some of the highest temperatures, is set to record its hottest ever...more

A turtle keeps cool in a pool in an Athens zoo June 26, 2007 as temperatures soared to 46 degrees Celsius (114.8 Fahrenheit) in parts of southeast Europe. Greece, which has seen some of the highest temperatures, is set to record its hottest ever June. REUTERS/Yannis Behrakis

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<p>People in kayaks navigate the Chicago River after it was dyed green as part of the city's annual St. Patrick's day celebrations in Chicago March 11, 2006.  REUTERS/John Gress</p>

People in kayaks navigate the Chicago River after it was dyed green as part of the city's annual St. Patrick's day celebrations in Chicago March 11, 2006. REUTERS/John Gress

People in kayaks navigate the Chicago River after it was dyed green as part of the city's annual St. Patrick's day celebrations in Chicago March 11, 2006. REUTERS/John Gress

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<p>Indian helmets sit on the field during the fourth day of their second test cricket match against England at Trent Bridge in Nottingham, central England, July 30, 2007.    REUTERS/Darren Staples  </p>

Indian helmets sit on the field during the fourth day of their second test cricket match against England at Trent Bridge in Nottingham, central England, July 30, 2007. REUTERS/Darren Staples

Indian helmets sit on the field during the fourth day of their second test cricket match against England at Trent Bridge in Nottingham, central England, July 30, 2007. REUTERS/Darren Staples

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<p>People dance during a rave party at Skolbeat Festival at Sambodrome, in Sao Paulo, April 24, 2004. REUTERS/Paulo Whitaker  </p>

People dance during a rave party at Skolbeat Festival at Sambodrome, in Sao Paulo, April 24, 2004. REUTERS/Paulo Whitaker

People dance during a rave party at Skolbeat Festival at Sambodrome, in Sao Paulo, April 24, 2004. REUTERS/Paulo Whitaker

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<p>A jellyfish floats in the Mediterranean sea off the south coast of the Balearic island of Mallorca August 7, 2006. REUTERS/Dani Cardona </p>

A jellyfish floats in the Mediterranean sea off the south coast of the Balearic island of Mallorca August 7, 2006. REUTERS/Dani Cardona

A jellyfish floats in the Mediterranean sea off the south coast of the Balearic island of Mallorca August 7, 2006. REUTERS/Dani Cardona

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<p>Stephen Quinto, 17, dressed as 'Night Crawler' joins thousands of comic book fans from around the world at the annual four-day Comic Con convention in San Diego, July 19, 2003.   REUTERS/Mike Blake </p>

Stephen Quinto, 17, dressed as 'Night Crawler' joins thousands of comic book fans from around the world at the annual four-day Comic Con convention in San Diego, July 19, 2003. REUTERS/Mike Blake

Stephen Quinto, 17, dressed as 'Night Crawler' joins thousands of comic book fans from around the world at the annual four-day Comic Con convention in San Diego, July 19, 2003. REUTERS/Mike Blake

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<p>Afghan widows line up at a food distribution centre run by CARE international in Kabul, Afghanistan January 26, 2006. REUTERS/Ahmad Masood</p>

Afghan widows line up at a food distribution centre run by CARE international in Kabul, Afghanistan January 26, 2006. REUTERS/Ahmad Masood

Afghan widows line up at a food distribution centre run by CARE international in Kabul, Afghanistan January 26, 2006. REUTERS/Ahmad Masood

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<p>Candles are stacked up near the entrance to the Grotto of Massabielle in Lourdes, September 9, 2007. REUTERS/Kevin Coombs    </p>

Candles are stacked up near the entrance to the Grotto of Massabielle in Lourdes, September 9, 2007. REUTERS/Kevin Coombs

Candles are stacked up near the entrance to the Grotto of Massabielle in Lourdes, September 9, 2007. REUTERS/Kevin Coombs

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<p>An Iranian man harnesses a donkey as he stands in the fog at Daryasar field in Mazandaran Province 300 km (186 miles) north of Tehran September 21, 2005. REUTERS/Morteza Nikoubazl</p>

An Iranian man harnesses a donkey as he stands in the fog at Daryasar field in Mazandaran Province 300 km (186 miles) north of Tehran September 21, 2005. REUTERS/Morteza Nikoubazl

An Iranian man harnesses a donkey as he stands in the fog at Daryasar field in Mazandaran Province 300 km (186 miles) north of Tehran September 21, 2005. REUTERS/Morteza Nikoubazl

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<p>Raindrops are seen on a rose in Svoronata after a storm on the Greek island of Kefalonia September 5, 2007. REUTERS/Darren Staples   </p>

Raindrops are seen on a rose in Svoronata after a storm on the Greek island of Kefalonia September 5, 2007. REUTERS/Darren Staples

Raindrops are seen on a rose in Svoronata after a storm on the Greek island of Kefalonia September 5, 2007. REUTERS/Darren Staples

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<p>Commuters check stock prices on an electronic board at a Tokyo securities office, near Tokyo railway station, August 22, 2005.  REUTERS/Kimimasa Mayama </p>

Commuters check stock prices on an electronic board at a Tokyo securities office, near Tokyo railway station, August 22, 2005. REUTERS/Kimimasa Mayama

Commuters check stock prices on an electronic board at a Tokyo securities office, near Tokyo railway station, August 22, 2005. REUTERS/Kimimasa Mayama

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<p>Revellers are covered in tomato pulp during the annual 'Tomatina' (tomato fight) in the Mediterranean village of Bunol, near Valencia, August 31, 2005. REUTERS/Albert Gea</p>

Revellers are covered in tomato pulp during the annual 'Tomatina' (tomato fight) in the Mediterranean village of Bunol, near Valencia, August 31, 2005. REUTERS/Albert Gea

Revellers are covered in tomato pulp during the annual 'Tomatina' (tomato fight) in the Mediterranean village of Bunol, near Valencia, August 31, 2005. REUTERS/Albert Gea

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<p>A hot air balloon is prepared for flight at the International Balloon Fiesta near Bristol in western England, August 10, 2007. REUTERS/Luke MacGregor </p>

A hot air balloon is prepared for flight at the International Balloon Fiesta near Bristol in western England, August 10, 2007. REUTERS/Luke MacGregor

A hot air balloon is prepared for flight at the International Balloon Fiesta near Bristol in western England, August 10, 2007. REUTERS/Luke MacGregor

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<p>A Chinese worker rests as he paints a newly built crane in the Long Wu port in Shanghai December 14, 2005. REUTERS/Nir Elias </p>

A Chinese worker rests as he paints a newly built crane in the Long Wu port in Shanghai December 14, 2005. REUTERS/Nir Elias

A Chinese worker rests as he paints a newly built crane in the Long Wu port in Shanghai December 14, 2005. REUTERS/Nir Elias

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