Hot walker Cesar Zarco helps give Kentucky Derby entrant Union Rags a bath at Churchill Downs on May 2, in Louisville, Ky.

Kentucky Derby entrant Daddy Nose Best grazes after a morning workout at Churchill Downs Wednesday, May 2, in Louisville, Ky.

Exercise rider Zeke Castro takes Kentucky Derby entrant Went the Day Well for a workout at Churchill Downs on May 1.

Horses and exercise riders walk to the track during early morning workouts as preparations are in full swing for the 138th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 1.

A young Malian refugee shelters in M'bere camp near Bassiknouin south-east Mauritania on May 2.

A youmg girl poses in the M'bere refugee camp near Bassiknou in the Nema region of Southwestern Mauritania on May 2. More than 320,000 people have fled their homes in Mali since mid-January, with more than half seeking refuge in neighbouring countries, UN officials said.

Malian army soldiers patrol in the M'bere refugee camp near Bassiknou in the Nema region of Southwestern Mauritania on May 2.

Egyptian anti-military protesters evacuate a demonstrator after he was wounded by rubber bullets during clashes in the Abbassiya district of Cairo on May 2. They wereattacked at an anti-military protest near the defence ministry in Cairo and several people were killed, officials said, in the politically tense run-up to the first post-uprising presidential election.

Protesters clash with Egyptian military outside the Defense Ministry in Cairo, Egypt, Wednesday, May 2. Suspected supporters of Egypt's military rulers attacked predominantly Islamist anti-government protesters outside the Defense Ministry in Cairo Wednesday, setting off clashes that left more than ten people dead as political tensions rise three weeks before crucial presidential elections.

Islamist protesters and their supporters run during clashes with armed "thugs" after an attack on protesters late Tuesday night, in Cairo May 2. Eleven people were confirmed dead after thugs attacked the protesters demanding an end to military rule after their candidate was barred from this month's presidential election.

Islamist protesters and their supporters clash with armed "thugs", after an attack on protesters late Tuesday night, in Cairo May 2. Eleven people were confirmed dead after thugs attacked the protesters demanding an end to military rule after their candidate was barred from this month's presidential election.

Egyptian protesters beat a man as he tries to escape on the back of a motorcycle after he was accused of attacking demonstrators in the Abbassiya district in Cairo on May 2. At least 12 people were killed when attackers stormed an anti-military protest near the defence ministry in Cairo, medics and a security official said. The fate of the man is unknown.

A patient lies on a hospital bed upon receiving anesthesia during cataract surgery at the Tilganga Eye Center in Kathmandu, Nepal on April 25, 2012. About 150,000 of Nepal's 26.6 million people are estimated to be blind in both eyes, most of them with cataracts.

Ethiopian doctor Fikru Melka checks a patient's eyes at the Tilganga Eye Centre on April 26, 2012.

A low-cost acrylic lens, also called an intraocular lens, is pictured on the monitor at the Tilganga Eye Centre's laboratory in Kathmandu on April 26, 2012. The lenses are produced at the center's laboratory by workers wearing bio-safe masks, helping bring the cost down to $4 per lens from more than $100 a piece.

Patients wait to receive anesthesia before undergoing cataract surgery.

Low-cost acrylic lenses are produced at the Tilganga Eye Center's laboratory. The center produces about 350,000 lenses annually and sells them to other nations.

Chinese activist Chen Guangcheng is seen in a wheelchair pushed by a nurse at the Chaoyang hospital in Beijing on May 2, 2012.

A man holds a sign that reads 'Free Chen Guangcheng, Democracy, China', outside an entrance to Chaoyang Hospital on May 2, 2012.

Human rights activist Jiang Tianyong speaks to journalists outside Chaoyang Hospital after his failed attempt to see Chen Guangcheng on May 2, 2012.

Afghan police personnel gesture as they evacuate onlookers from the site of a suicide bomb attack in Kabul on Wednesday, May 2.

Afghan security forces members inspect the site of a car bomb attack in Kabul on Wednesday.

An elderly woman waves as she finds herself caught ahead of an Occupy Wall Street May Day march down Fifth Ave. in New York on May 1.

An Anti-capitalist protester from the 'Occupy' movement lays in front of a police officer in Paternoster Square in London on May 1.

Occupy Wall Street protesters celebrate in Union Square park as they demonstrate in New York City on May 1.

Occupy Wall Street partcipants gather to stage a May Day march at Bryant Park in New York on May 1.

Some protesters chose to demonstrate more quietly during May Day celebrations in New York.

Protesters affiliated with Occupy Wall Street march down Broadway in Manhattan towards Wall Street as a man dressed as Captain America stands in a window on May 1.

A protester holds a rose with a bubble on it in front of police at a rally for International Worker's Day on May 1 in Oakland, Calif.

Police tape off a Wells Fargo Bank in Seattle Tuesday, May 1, after protesters broke the bank's windows during a May Day march.

Shattered window glass from a Wells Fargo Bank in Seattle Tuesday, May 1, 2012, after protesters broke the bank's windows during a May Day march after some in the crowd turned violent.

Hundreds of people gather in Seattle's Westlake Park to celebrate and protest on Tuesday, May 1.

Ng Ah Kwai, 50, of Penang, Malaysia, who was born with deformed arms, paints with his foot during the Mouth and Foot Painting Convention in Singapore May 1, 2012. Over 70 handicapped artists are showcasing 200 artworks at the exhibition which takes place from May 1 to May 6.

People watch Aw Kwai Ng (L) from Malaysia give a demonstration on foot painting techniques.

A delegate views artwork on dispay at an exhibition during the Mouth and Foot Painting Artists (MFPA) Convention.

Tan Kok Leong from Singapore gives a demonstration of mouth painting techniques.

An 'Occupy London'' protester hands out flowers to commuters in a central London train station to mark May Day, May 1.

People march on a sidewalk during a May Day protest in New York on May 1. People around the world are gathering for May Day protests against austerity measures and calling for higher wages. In the United States, the Occupy Wall Street movement is trying to use May Day to rejuvenate.

Workers clean the vandalized windows of a Bank of America branch in Washington, Tuesday, May 1. In the US, May Day demonstrations, strikes and acts of civil disobedience were planned, including what could be the country's most high-profile Occupy rallies since the anti-Wall Street encampments came down in the fall.

A protester affiliated with the Occupy Wall Street movement is stopped by the police as he stands in the middle of Sixth Avenue during a protest march to the Bank of America headquarters in New York City May 1. Occupy Wall Street joins labor groups for a day of protests on Tuesday to mark International Workers Day and to try to breathe fresh life into the movement that sparked a wave of nationwide protests against economic injustice eight months ago.

California Highway Patrol officers take positions at the Golden Gate Bridge in anticipation of May Day demonstrations in San Francisco, California May 1. Authorities anticipated demonstrators would shut down the bridge, but agreement was reached to prevent that action.

People march past a bank during a May Day protest in New York. People around the world are gathering for May Day protests against austerity measures and calling for higher wages. In the United States, the Occupy Wall Street movement is trying to use May Day to rejuvenate.

Occupy Wall Street demonstrators dance as hundreds of protesters gather during a May Day labor rally in Bryant Park on May 1, in New York City. Demonstrators have called for nation-wide May Day strikes to protest economic inequality and political corruption.

Visitors looks at the vehicles at an oval track of a velodrome during an old timer car and motorcycle show in Budapest on May 1.

Men ride bicycles on an oval track of a velodrome during an old timer car and motorcycle show in Budapest on May 1. The event brought life again into the 412 meter long Millennial Velodrome of Budapest, which was built in 1896 and is one of the oldest arenas for track cycling in Europe.

An elderly man rides his motobike on an oval track of a velodrome during an old timer car and motorcycle show in Budapest on May 1. The event brought life again into the 412 meter long Millennial Velodrome of Budapest, which was built in 1896 and is one of the oldest arenas for track cycling in Europe.

Drivers drive their vehicle on an oval track of a velodrome during an old timer car and motorcycle show in Budapest on May 1. The event brought life again into the 412 meter long Millennial Velodrome of Budapest, which was built in 1896 and is one of the oldest arenas for track cycling in Europe.

A woman driver waits besides her car near the oval track of a velodrome during an old timer car and motorcycle show in Budapest on May 1. The event brought life again into the 412 meter long Millennial Velodrome of Budapest, which was built in 1896 and is one of the oldest arenas for track cycling in Europe.

The rusting hulk of an abandoned ship is beached on the coastline in Lagos, Nigeria. All photos taken March 15, 2012 and made available May 1, 2012.

Last August, Nigeria's Transport Minister Yusuf Suleiman promised to remove the wrecks within weeks, but nothing was done.

A man climbs out of the wreckage of an abandoned ship. Groups of salvagers move along the coast, removing whatever electronics and communication gear remains inside.

Villagers along with Border Security Force (BSF) personnel engaged in a rescue operation for a capsized ferry at the Brahmaputra River in Bura-Buri village in Goalpara district in Assam, India, on May 1, 2012.

Divers and rescue workers stepped up the search for survivors on Tuesday, May 1, 2012. The double-decked ferry was carrying approximately 300 passengers when it capsized during a storm in the western district of Dhubri on Monday evening. Some 100 people swam to safety or were rescued.

Relatives mourn alongside the bodies of victims of the ferry disaster on May 1, 2012. Indian authorities said that some bodies might have been washed downstream into Bangladesh.

Indonesian workers shout slogans during a rally to mark May Day in Jakarta on May 1, 2012. Thousands of Indonesian workers staged the rally demanding the government raise the minimum wage and reject outsourcing.

A man carries a poster reading "Putin is our President!" during the May Labor Day rally of the Russian Trade Unions and United Russia party in Moscow on May 1, 2012. Russia's president-elect Vladimir Putin and outgoing head of state Dmitry Medvedev on Tuesday joined over 100,000 people in a Soviet-style mass march through Moscow.

Protesters dance around the burnt effigy of Philippine President Benigno Aquino III during a May Day rally near the Presidential Palace in Manila on May 1, 2012. Thousands of workers marched under a brutal sun in Manila to demand a wage increase amid an onslaught of oil price increases, but the Philippine President rejected a $3 daily pay hike which the workers have been demanding since 1999 and warned may worsen inflation, spark layoffs and turn away foreign investors.

Bahraini Shiites attend a demonstration celebrating Labor Day in the village of Muqsha'a on April 30, 2012. Many Shiite employees were either dismissed or indefinitely suspended from their jobs in the wake of a brutal crackdown by the Bahrain government.

Indian sex workers hold candles and posters as they march in a May Day rally asking for their rights and the recognition of their profession in Kolkata, late on April 30, 2012.

Visitors takes picture in front of Tiananmen gate in Beijing, China, on May 1, 2012. Tens of thousands of visitors flock to the area around Tiananmen Square to enjoy a public holiday to mark May Day.

Russian President Dmitry Medvedev (2nd L), Prime Minister Vladimir Putin (2nd R), Independent Trade Unions' Chairman Mikhail Shmakov (L) and State Duma deputy Viktor Pinsky (R) toast in a bar after attending a rally in Moscow on May 1, 2012.

Garment workers attend a rally to mark May Day at Paltan in Dhaka, Bangladesh, on May 1, 2012. Different workers organizations have arranged programmes inluding a rally, seminars and cultural events as they demand the establishment of workers' rights.

Laborers drilling a mountain to extract rocks inside a stone quarry on May 1, 2012 in Srinagar, Kashmir. Local labor leaders told media their colleagues at many construction sites were denied a May Day public holiday by their employers.

A shepherd leading his livestock along a road in Abbottabad, Pakistan on April 29, 2012.