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WASHINGTON, May 20 (Xinhua) -- Two U.S. astronauts conducted the first of four spacewalks for space shuttle Endeavour's STS-134 mission on Friday morning, the U.S. National Aeronautics and Space Administration (NASA) said.According to the U.S. space agency, Endeavour's mission specialists Andrew Feustel and Greg Chamitoff completed the six-hour, 19-minute spacewalk at 9:29 a.m. EDT (1329 GMT). They successfully installed antennas for the External Wireless Communication system, routing cables, setting up the antenna, installing handrails, and connecting power cables.Because of a carbon dioxide sensor failure in Chamitoff's spacesuit, flight controllers limited his spacewalk time to about six hours 20 minutes, 10 minutes less than the planned six hours and 30 minutes. There was no indication his suit's carbon dioxide levels would rise. However, they deferred tasks to remove a micrometeoroid debris shield to access and attach some of the connection points.This was the 245th spacewalk conducted by U.S. astronauts. It was Feustel's fourth spacewalk for a total time of 27 hours and 17 minutes, and Chamitoff's first.Endeavour lifted off on Monday morning from Kennedy Space Center in Florida, to deliver to the International Space Station a 2-billion-dollar, multinational particle detector known as the Alpha Magnetic Spectrometer (AMS).AMS, a particle physics detector, is designed to search for various types of unusual matter by measuring cosmic rays. Its experiments are designed to help researchers study the formation of the universe and search for evidence of dark matter, strange matter and antimatter.

UNITED NATIONS, April 1 (Xinhua) -- UN Secretary-General Ban Ki- moon on Friday called for greater public awareness of autism, in order to fight the stigma and discrimination facing those who suffer from the disorder.The statement came in a message to mark the annual World Autism Awareness Day, observed globally on April 2."Children and persons with autistic conditions face major challenges associated with stigma and discrimination, as well as a lack of access to support," said Ban."Far too many suffer terrible discrimination, abuse and isolation, in violation of their fundamental human rights," he added.Autism is a disorder that affects the brain's development of social and communication skills, and generally appears in the first three years of life."The number of children and people with autistic conditions continues to rise -- in every nation and in every racial, ethnic and social group," the secretary-general said.Ban said it is critical to support parents of children with the disorder and "create jobs for individuals with autism based on their skills and strengths, and improve public education to better meet the needs of students with autism."

BEIJING, April 19 (Xinhuanet) -- Almost one year after the disastrous oil spill, scientists believe that the overall health of the Gulf of Mexico as nearly back to normal.However, the scientists restrain their optimism about nature's resiliency with the glaring blemishes out there. It's been nearly a year since BP's Gulf of Mexico oil spill began last April, triggering one of the world's worst environmental disasters. Nearly 5 million barrels of oil leaked from the ruptured Deepwater Horizon well during the months-long catastrophe.BP said last November that the disaster cost it nearly 40 billion U.S. dollars, according to a Guardian report.According to a BP survey of researchers, over three dozen scientists grade the Gulf's big picture health a 68 on average, using a 1-to-100 scale.That's just a few points below the 71 the same researchers gave last summer when asked what grade they would give the ecosystem before the spill. And it's an improvement from the 65 given back in October after months of the oil spill.

BERLIN, May 26 (Xinhua) -- German health officials said Thursday that cucumbers imported from Spain was one source of a recent deadly E. coli outbreak in northern states that killed three people and made hundreds sick.The Hamburg Institute for Hygiene and the Environment (HU) found that four cucumbers in a local market were contaminated by Enterohaemorrhagic E. coli (EHEC), and three of them were imported from two separate Spanish suppliers, Hamburg state health authorities said.The origin of the fourth cucumber was still under investigation, officials added.German supermarkets began to pull Spanish cucumbers off shelves Thursday afternoon following the findings in Hamburg. The food- monitoring agencies in the northern states were launching investigations on vegetable markets, the federal agriculture ministry said in a statement.Figures showed that Spain is Germany's second largest supplier of cucumbers within the European Union, accounting for some 40 percent of the country's cucumber imports.Scientists said that EHEC is a virulent strain of gut bacterium that can cause severe stomach upsets, diarrhea, stroke and coma. It would lead to kidney failure in extreme cases.Germany saw a terrible E. coli outbreak two weeks ago, starting from the northern states like Hamburg and then spreading to eastern and southern regions. German health authorities said that at least three people have died from infections, and more than 200 have been diagnosed with hemolytic-uremic syndrome (HUS), which is caused by EHEC.Germany's national disease centre, the Robert Koch Institute, suggest people avoid eating raw tomatoes, cucumbers and lettuce for a while.

SANAA, Feb. 5 (Xinhua) -- The Somali pirates hijacked a Chinese-flagged commercial ship off Yemen's western city port of al- Hudaida in the Red Sea, Chinese military attache to Yemen confirmed to Xinhua on Saturday.The Chinese military confirmed that the Chinese-flagged commercial ship, which was registered in Hongkong, China, had been hijacked by the Somali pirates off the Yemeni coast, Chinese military attache to Yemen told Xinhua.The ship was then moved by the pirates towards the Somali coasts, he added, without providing how many people were on board or the date of the hijack.Earlier, Yemeni Interior Ministry said the Chinese ship called "Tien Hau" was attacked by the pirates some 11 nautical miles (20. 4 kilometers) off the Yemeni island of Al-Tair off the city port of al-Hudaida.Meanwhile, a security source at the ministry told Xinhua "the security operation room of the ministry received unconfirmed information that an anti-piracy international navy fleet might intercept the pirates and help release the Chinese ship.""We are following up the situation to confirm the release of the Chinese ship, as coast guard boats were dispatched to track the ship and pirates," he told Xinhua on condition of anonymity."The hijack took place early today, but we do not have exact information about the number of the ship's crew," he added.The Gulf of Aden is considered as one of the world's most dangerous waters because of rampant piracy.