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SAN FRANCISCO, May 25 (Xinhua) -- Micro-blogging service Twitter on Wednesday confirmed that it has bought TweetDeck, a London-based startup that develops application to help people organize information posted on Twitter."Today, we're pleased to announce that the TweetDeck team has joined Twitter," Dick Costolo, Twitter's chief executive officer (CEO), said in a blog post."This acquisition is an important step forward for us. TweetDeck provides brands, publishers, marketers and others with a powerful platform to track all the real-time conversations they care about," he added.Founded in 2008, TweetDeck now has a team of 15 and offers a real-time application that allows users to monitor abundance of information from social media services including Twitter in a single concise view."Change may well be inevitable, but we remain the same team, staying in London, with the same focus and products, and now with the support and resources to allow us to grow and take on even bigger challenges," Iain Dodsworth, founder and CEO of TweetDeck, noted in a separate blog post.The deal is a defensive move for Twitter aimed at preventing TweetDeck from being purchased by rivals, some analysts said.Financial terms of the transaction were not disclosed, but technology blog site TechCrunch and other U.S. media reported that Twitter paid 40 million to 50 million U.S. dollars.

CAIRO, Jan. 23 (Xinhua) -- As part of bilateral efforts to enhance cultural cooperation between the two great civilizations, China, as the Guest of Honor, will participate in the 43rd Cairo International Book Fair in Egypt."An outstanding Chinese delegation will attend the fair to inform the Egyptian people all about Chinese culture," said Chen Dongyun, cultural counsellor of the Chinese Embassy in Egypt.Some 248 publishers, 13 renowned scholars, writers and artists will display about 10,000 books about the achievements made by China in various fields such as politics, economy, science and technology, and culture.The fair, the most important of its kind in the Arab region, will be held on Jan. 29 through Feb. 8 in the Cairo International Conference Center. The annual fair began in 1969.The Chinese hall in the center covers an area of 1,400 square meters, with special areas allocated for a variety of exhibitions about the history of the evolution of Chinese characters, photos reflecting Sino-Egypt friendship and landscape of modern China and intangible cultural heritage.The fair also includes a seminar featuring literature and translation among Chinese and Egyptian writers and artists and a week-long film show in which six Chinese films with Arabic subtitles will be introduced to the audience.Chinese participation reflected the common consensus of the leaders of the two countries to deepen mutual understanding and friendship and will serve to promote the sound and sustainable development of bilateral relations, Chen said.Zhang Jichen, vice president of China National Publications Import and Export (Group) Corporation, which is in charge of the organization of the Chinese activities at the fair, said a cooperation agreement between the General Administration of Press and Publication of China and Egypt's Ministry of Culture.China will also present some 1,000 high-quality books to the National Library and Archives of Egypt and the Alexandria Library.The fair is expected to attract 632 publishers from 29 countries, including 17 in the Middle East. More than two million visitors participate in the fair each year.

LOS ANGELES, May 25 (Xinhua) -- NASA project managers bade farewell to the Mars rover Spirit on Wednesday after sending a final set of commands to the stranded vehicle.This marks the completion of one of the most successful missions of interplanetary exploration ever launched, NASA's Jet Propulsion Laboratory (JPL) said."Last night, just after midnight, the last recovery command was sent to Spirit," said John Callas, the Mars Exploration Rover Project manager at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, Los Angeles."It would be an understatement to say this was a significant moment. Since the last communication from Spirit on March 22, 2010, as she entered her fourth Martian winter, nothing has been heard from her."NASA has tried in vain to regain communication with Spirit since it got stuck in sand about two years ago. The rover last communicated on March 22, 2010, as Martian winter approached and the rover's solar-energy supply declined.NASA checked frequently in recent months for possible reawakening of Spirit as solar energy available to the rover increased during Martian spring, but to no avail.A series of additional re-contact attempts ended on Wednesday, designed for various possible combinations of recoverable conditions, according to JPL."Our job was to wear these rovers out exploring, to leave no unutilized capability on the surface of Mars, and for Spirit, we have done that," said Callas.

You can think of NASA's Discovery program as a sort of outer-space American Idol: every few years the agency invites scientists to propose unmanned planetary missions. The projects have to address some sort of fundamental science question, and (this is the tough part) they have to be relatively cheap to pull off — say, half a billion dollars or so. Then the proposals go through a grueling competition before judges who aren't as nasty as Simon Cowell but who are every bit as tough. The one left standing at the end gets the equivalent of a recording contract: NASA supplies the funding and the launch vehicle, and away the winner goes — to orbit Mercury, as the Messenger spacecraft is doing right now; or to rendezvous with a couple of asteroids, as the Dawn mission will start doing this July; or to smash into a comet on purpose, a feat achieved by Deep Impact in 2005, a mission not to be confused with the movie of the same name. Now it's time for the next contenders. NASA has just announced that the first round of the latest Discovery competition is over, with three entries out of 28 moving on to the finals. They are, in increasing distance from Earth: the Geophysical Monitoring Station (GEMS) lander, which would use seismometers to study the interior of Mars; the Comet Hopper, which would do just that, leaping from place to place across the surface of Comet 46P/Wirtanen to see how different parts of the tumbling body react to heating by the sun; and the Titan Mare Explorer (TiME), which would plop into a sea of liquid hydrocarbons on Saturn's moon Titan — the first oceangoing vessel ever to set sail on another world. If you had to come up with a theme that ties all three missions together, it would be "origins." The Titan explorer, for example, will be studying a place that — in a crude way, at least — resembles the early planet Earth at a time when life arose here. Titan, with a thick atmosphere and a bizarro-world form of weather featuring toxic winds and hydrocarbon rain, is home to a mix of complex chemistry, complete with organic molecules. The oceans provide a medium in which the molecules can move around and interact with each other. It's even conceivable, though clearly a long shot, that some form of microscopic life already exists on this frigid moon. The Mars lander, by contrast, would visit a place where the seas — plain water in this case — vanished long ago. But the mission of GEMS goes far deeper than that. By analyzing Marsquakes on the Red Planet, GEMS will try to get a handle on what the interior of Mars is like. Scientists don't currently know whether the planet's core is liquid, like Earth's, or solid, or some mushy consistency in between. It all depends on how efficiently Mars has cooled since it formed 4.5 billion years ago, and that depends in turn on the planet's internal structure. "That's the mission," says Bruce Banerdt, of NASA's Jet Propulsion Laboratory, the lead scientist for GEMS. "We want to understand how Mars was built." Along with sensitive seismographic equipment, GEMS will drill down about 20 ft. (6 m) with a thermometer-equipped probe, trying to figure out how quickly the temperature rises with depth. "That will let us extrapolate all the way down to the center," Banerdt says, "which will tell us how fast Mars is cooling."

N'DJAMENA, Feb. 16 (Xinhua) -- Chadian President Idriss Deby Itno said Wednesday while meeting visiting Chinese Foreign Minister Yang Jiechi that his country is willing to expand cooperation with China in infrastructure building, agriculture, health care and other fields.During the meeting with Yang, who arrived here Tuesday for an official visit, the president said the Chadian-Chinese relations are based on equality, mutual respect and noninterference in each other's interior affairs. He said China has successfully completed a number of aid projects in Chad, which greatly facilitated the social and economic development of the African country.Deby said Chad is willing to boost cooperation with China in such areas as infrastructure construction, agriculture and health care, and hopes to strengthen coordination with China on international affairs.For his part, Yang said Chad has undertaken the path of national reconciliation, political stability and social progress under the leadership of President Deby, and has made significant achievements in economic development and improvement of the welfare of the Chadian people.He said bilateral relations are developing rapidly since the re-establishment of diplomatic ties, with cooperation and exchanges at different levels significantly increased. The two sides have improved mutual political trust, supported each other on matters regarding each other's core interests, and seen continuous progress in trade and economic cooperation, said the foreign minister.Yang said China sees Chad as an important partner in Africa, and China is willing to further boost mutual political trust with Chad, expand trade and cooperation in infrastructure building, telecommunications as well as education sectors.The visiting Chinese FM also met with his Chadian counterpart Moussa Faki Mahamat Wednesday on further improving bilateral relations and cooperation.

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