

First Lady Michelle Obama flexes her muscles with the children at the River Terrace School in Washington, D.C., during a 'Let's Move' event to promote physical fitness on Wednesday. Evan Vucci/AP
Antigovernment demonstrators construct a makeshift barricade as others look on in Bangkok, Thailand, on Wednesday. According to his official spokesman, Thailand's Prime Minister Abhisit Vejjajiva is ready to negotiate with the 'red shirt' protesters who are seeking a change of government, but only when the demonstrators who have illegally occupied city streets agree to abide by the country's laws. Wason Wanichakorn/AP
People watch a parade commemorating Brasilia's 50th anniversary on Wednesday. Built from scratch 600 miles inland, Brasilia was envisioned as a dream city, a transformational project to give Latin America's largest nation a modern capital. Eraldo Peres/AP
One of the two white tiger cubs at Serengeti Safari Park in Hodenhagen, Germany, is held by its surrogate 'father' Hameed Hamza during a press conference on Wednesday. The cubs, born on March 8 and named Rico and Kico, have been bottle-fed by their surrogate mother Regina Hamza (not shown). Focke Strangmann/AP
A plume of ash rises from the volcano in Iceland's Eyjafjallajokull glacier on Wednesday. Airlines lost at least $1.7 billion in revenue during the volcanic ash crisis, an industry group said Wednesday as the debate heated up over whether European governments were justified in shutting down their airspace for so long. In Iceland, where all the trouble began with an April 14 eruption, there was no sign Wednesday that the Eyjafjallajokull volcano would stop erupting anytime soon, according to Pall Einarsson, a geophysicist at the Institute of Earth Sciences in the capital Reykjavik. Brynjar Gauti/AP
Thrainn Gudmumds sweeps wet ash from the roof of his home on Wednesday in Hvolsollur, Iceland. Carolyn Kaster/AP
Rocks are reflected in a lake muddied with volcanic ash at the base of Iceland's Eyjafjallajokull on Wednesday. The volcano, which is still erupting but spewing less ash, according to the meteorological office experts, is being closely monitored alongside a potentially more dangerous volcano, Katla. Lucas Jackson/Reuters
A laborer takes a break on a pile of boxes waiting to be shipped to Europe at the air cargo terminal in Dhaka, Bangladesh, on Wednesday. The International Air Transport Association says disruptions to European air travel from the volcanic ash cloud have cost the industry at least $1.7 billion. Pavel Rahman/AP
Bosnian war veterans clash with police as they storm and set fire to a Bosnian federal government building in Sarajevo on Wednesday. Police fired tear gas at thousands of veterans from Bosnia's 1992-95 war who were protesting cuts to their benefits. Amel Emric/AP
Taiwan's ruling Nationalist Party legislator Chao Li-yun is silenced in the middle of a scuffle in a parliament session inside the legislature on Wednesday in Taipei, Taiwan. The altercation broke out during disagreements on the issue of whether students from mainland China would be allowed to attend Taiwan's universities. AP
Medical staff wheel away a rescued oil worker in this image taken from the US Coast Guard video made available on Wednesday. At least 11 people were missing and seven injured after an explosion and fire at an oil drilling platform off the coast of Louisiana. US Coast Guard/APTN/AP
The crew of a Coast Guard Kodiak-based rescue helicopter prepares to rescue one of four crewman from the fishing vessel Northern Belle who managed to climb into a life raft dropped by a Coast Guard aircraft in the Gulf of Alaska on Tuesday. The Northern Belle crew issued a Mayday call and abandoned the 75-foot Seattle-based vessel on Tuesday afternoon. Petty Officer 1st Class Sara Francis/US Coast Guad/AP
A street vendor sells peanuts during rush hour traffic in Jakarta, Indonesia, on April 21. Dita Alangkara/AP
US actress and honorary co-chair of 1GOAL, Jessica Alba, sits with students at a school in Accra, Ghana, while on a trip to Africa to raise awareness of the importance of education. Alba joined congressional leaders in Washington to speak about her trip and to help announce the reintroduction of the Education for All Act, which would increase US funding and focus on global education. Morgana Wingard/ONE/AP
A 3-month-old unnamed bear cub plays during a media session at its enclosure at the zoo in Stavropol, Russia, on Wednesday. Eduard Korniyenko/Reuters