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BEIJING, June 29 (Xinhuanet) -- Twitter Inc. co-founders Biz Stone and Evan Williams said they are moving on from the microblogging service, media reports said Wednesday.“The Twitter crew and its leadership team have grown incredibly productive,” Stone said on the blog. “I’ve decided that the most effective use of my time is to get out of the way until I’m called upon to be of some specific use.”The two will continue to advise Twitter on strategic matters, but devote the lions' share of their time to The Obvious Corporation, Stone said.Obvious was first created by Williams to buy back a company from investors that he and Stone failed to sell about six years ago, Stone said. The two began working together after leaving Google in 2005.The company will also be run by Jason Goldman, a former Twitter executive, Stone said.

KATSINA, Nigeria May 31 (Xinhua) -- At least 10 secondary school teachers are reported to have died of food poisoning, and several others hospitalized in northern Nigeria's Katsina State, the News Agency of Nigeria reported on Tuesday.The incident occurred at the weekend at a workshop organiZed by the state Ministry of Education for some 650 teachers at Government Day Secondary School (GDSS), Kofar Yan'daka, Katsina.The report said soon after taking their lunch, supplied by a popular corporate caterer on the fateful day, some of the teachers were vomiting and afflicted by diarrhoea, as a result of which they were rushed to the Federal Medical Center, Katsina and the Police Clinic for medication.Ten of the affected teachers were said to have died as a result of the infection.State police spokesperson Abubakar Ibrahim confirmed the incident to reporters.He said only one teacher died, while 19 others were hospitalized.He said 12 of the affected teachers had already been discharged from the hospitals, while seven others were still on admission at the Federal Medical Center and Katsina Police Clinic.He said the police had already collected sample of the food supplied by the caterer for clinical analysis.

WASHINGTON, Aug. 11 (Xinhua) -- The unique fossils of an adult plesiosaur and its unborn baby may provide the first evidence that these ancient animals gave live birth like mammals, according to a new study to be published Friday in the journal Science.The 78-million-year-old, 15.4-foot-long (4.7-meter-long) adult specimen is a Polycotylus latippinus, one of the giant, carnivorous, four-flippered reptiles that lived during the Mesozoic Era.Dr. Robin O'Keefe of Marshall University in West Virginia and Dr. Luis Chiappe, Dinosaur Institute director of the Natural History Museum in Los Angeles County, have determined that it is the fossil of an embryonic marine reptile contained within the fossil of its mother.The embryonic skeleton contained within shows much of the developing body, including ribs, 20 vertebrae, shoulders, hips, and paddle bones.O'Keefe and Chiappe have also determined that plesiosaurs were unique among aquatic reptiles in giving birth to a single, large offspring, and that they may have lived in social groups and engaged in parental care.Although live birth has been documented in several other groups of Mesozoic aquatic reptiles, no previous evidence of it has been found in the important order of plesiosaurs."Scientists have long known that the bodies of plesiosaurs were not well suited to climbing onto land and laying eggs in a nest," O'Keefe said."So the lack of evidence of live birth in plesiosaurs has been puzzling. This fossil documents live birth in plesiosaurs for the first time, and so finally resolves this mystery."

UNITED NATIONS, June 9 (Xinhua) -- China on Thursday called for governments, organizations and individuals to take active actions, enhance solidarity and establish joint prevention and treatment mechanism to deal with AIDS.Yin Li, vice Health minister of China made the remarks as he addressed the United Nations High-Level Meeting on HIV/AIDS held here."As a responsible developing country, the Chinese government has actively fulfilled its commitments in achieving universal access to AIDS prevention and treatment, eliminating social discrimination, and ensuring rights to prevention, treatment and care of people living with HIV/AIDS and their families," he said.Thanks to the efforts over the years, the spread of AIDS epidemic in China has slowed down, the morality rate considerably decreased and life quality of people with HIV/AIDS has significantly improved, Yin added.In order to achieve the goal of zero new HIV infections, zero discrimination and zero AIDS-related deaths defined by the joint UN Program on HIV/AIDS (UNAIDS), China called for all countries, organizations and persons to be mobilized, further enhance solidarity and clearly define responsibilities and establish a joint prevention and treatment mechanism.Yin said that in the face of the common challenge of HIV/AIDS, the developed and developing countries must assume shared responsibilities."The developed countries should further provide developing countries with generous, unconditional financial and technical support. The developing countries should give the same priority to AIDS control as economic development, explore the models of prevention and treatment consistent with their national conditions, " he said.In addition, the private sector and relevant organizations should assume more responsibilities. On one hand, efforts should be made to mobilize more resources in better implementing prevention, treatment and care measures; on the other hand, multinational drug manufactures should reduce drugs and testing equipment prices through technology transfer, contract manufacturing and reduction of monopoly profits in order to provide universal access to treatment services, according to Yin.Yin stressed that the Chinese government would strengthen its working mechanism, enhance coordination across sectors and participation by the entire society, continue to actively participate in global fight against AIDS, assume its responsibilities and obligations so as to make contribution to achieving the goal of global AIDS control.

BEIJING, Aug. 24 (Xinhuanet) -- Facebook said it is overhauling its privacy settings to give members easier, more precise control over who sees posts, photos and other content over the vast social network.Starting Thursday, Facebook is rolling out new privacy tools that are placed with each piece of content, replacing options that are now buried in overall account settings.Privacy has been a consistently sticky problem for the Palo Alto firm, which has felt the heat from privacy advocates and government regulators. And recently, Facebook faced stiffer competition from Google's new Google+ social network, which was hailed for including a "circles" feature with easy-to-use privacy settings.Instead of vague labels such as "everyone," which have been mistaken for a Facebook member's social network instead of anyone on the Internet, the new system will include more precise words such as "public.""You have told us that 'who can see this?' could be clearer across Facebook, so we have made changes to make this more visual and straightforward," Chris Cox, Facebook's vice president of product, said in blog post."The main change is moving most of your controls from a settings page to being inline, right next to the posts, photos and tags they affect. Plus there are several other updates here that will make it easier to understand who can see your stuff (or your friends') in any context," Cox said.While privacy advocates reserved judgment until the new settings are actually released, they were optimistic the changes will benefit consumers."These changes do make me feel very confident in the direction that Facebook is going and the way they are thinking about privacy," said Erica Newland, policy analyst for the Center for Democracy & Technology in Washington, D.C.