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BEIJING, May 20 (Xinhuanet) -- Scientists have discovered a Jupiter-sized exoplanet that is completely unbound from a host star, according the scientific journal "Nature" published Thursday.The research was conducted by astrophysicists from Osaka University in Japan.Using the technique called "gravitational microlensing", scientists turned their telescopes towards the centre of the Milky Way and detected this "lonely planet" moving in a extremely large orbit, which suggested it does not connect to any solar system.Then they estimated the total number of such wondering planets could be as many as 400 billion, based on the detection efficiency. This number far outnumbers the main-sequence stars such as our Sun."This is an amazing result, and if it is right, the implications for planet formation are profound," says astronomer Debra Fischer at Yale University in New Haven, Connecticut.And scientist began to consider the possibility that liquid water could exist on this kind of unbound planets. "That might be an attractive possibility for life," said David Stevenson, a planetary scientist at the California Institute of Technology.

WASHINGTON, May 25 (Xinhua) -- The number of young adults in the United States with high blood pressure may be much higher than previously reported, according to a new study by researchers at the University of North Carolina (UNC) at Chapel Hill.Researchers analyzed data on more than 14,000 men and women between 24 and 32 years old in 2008 from the National Longitudinal Study of Adolescent Health, known as Add Health. They found 19 percent had elevated blood pressure, also referred to as hypertension. Only about half of the participants with elevated blood pressure had ever been told by a health-care provider that they had the condition."The findings are significant because they indicate that many young adults are at risk of developing heart disease, but are unaware that they have hypertension," said Quynh Nguyen, a doctoral student at UNC's Gillings School of Global Public Health and the study's lead author. Hypertension is a strong risk factor for stroke and coronary heart disease, the leading cause of death for adults in the United States.The findings were published this week in the journal Epidemiology.Kathleen Mullan Harris, Add Health's principal investigator and a co-author of the paper, said the findings were noteworthy because they were from the first nationally representative, field- based study of blood pressure to focus on young adults."The message is clear," said Harris. "Young adults and the medical professionals they visit shouldn't assume they're not old enough to have high blood pressure. This is a condition that leads to chronic illness, premature death and costly medical treatment."

CHICAGO, Jan. 21 (Xinhua) -- Chinese President Hu Jintao left Chicago for home on Friday after concluding a four-day state visit to the United States, during which Hu and his U.S. counterpart Barack Obama agreed to build a China-U.S. cooperative partnership based on mutual respect and mutual benefit.President Hu, who began his visit on Tuesday, had extensive and in-depth discussions with Obama at the White House on Wednesday on major bilateral, regional and world issues.The two sides reached "important agreement on China-U.S. relations and major international and regional issues of shared interest," the Chinese president said when he and Obama met the press following their discussions."We both agree to further push forward the positive, cooperative and comprehensive China-U.S. relationship," Hu said, adding that both sides also pledged to forge "a China-U.S. cooperative partnership based on mutual respect and mutual benefit" for the benefit of the two countries and beyond.The Chinese president said he and Obama also discussed some disagreements in the economic and trade area, with both sides pledging "to continue to appropriately resolve these according to the principle of mutual respect and consultation on an equal footing."Also on Wednesday, Hu attended a state dinner and a welcome ceremony hosted by Obama.Hu told the Americans on several occasions in Washington that the purpose of his visit to the United States was "to increase mutual trust, enhance friendship, deepen cooperation and advance the positive, cooperative and comprehensive China-U.S. relationship for the 21st century."During Hu's visit, the two countries issued the "China-U.S. Joint Statement," which says "China and the United States committed to work together to build a cooperative partnership based on mutual respect and mutual benefit in order to promote the common interests of both countries and to address the 21st century's opportunities and challenges.""China and the United States are actively cooperating on a wide range of security, economic, social, energy, and environmental issues which require deeper bilateral engagement and coordination," the statement said.On Thursday, Hu called upon the U.S. Congress to continue helping the two countries boost their relations.Pursuing a healthy and steady development of China-U.S. ties is China's established policy and strategic choice, Hu stressed when meeting House Speaker John Boehner and Senate Majority Leader Harry Reid.Also on Thursday in Washington, Hu delivered an important speech at the welcome luncheon hosted by friendly organizations in the United States.To advance the sustained, sound and steady development of China-U.S. relations serves the fundamental interests of peoples of China and the United States, he said.

WASHINGTON, Jan. 19 (Xinhua) -- China and the United States have agreed to further boost their bilateral relationship toward a cooperative partnership for the benefit of the whole world, President Hu Jintao said Wednesday.The visiting Chinese leader presented the course forward at a joint press conference at the White House with his U.S. counterpart Barack Obama following their eighth meeting in two years.During the talks, conducted in "a candid, pragmatic and constructive atmosphere," the two sides reached "important agreement on China-U.S. relations and major international and regional issues of shared interests," according to the Chinese president.Chinese President Hu Jintao (2nd L) holds a bilateral meeting with U.S. President Barack Obama (2nd R) at the White House in Washington, the United States, Jan. 19, 2011. "We both agree to further push forward the positive, cooperative and comprehensive China-U.S. relationship," Hu said, adding that both sides also pledged to forge "a China-U.S. cooperative partnership based on mutual respect and mutual benefit" for the benefit of the two countries and beyond.Meanwhile, the two sides "should firmly adhere to the right direction," respecting each other's core interests and handling their relations with a long-term perspective, which will enable both countries to make greater contributions to world peace and development, he said.Citing the growing number of global challenges, the Chinese president stressed that Beijing and Washington "share expanding common interests and shoulder increasing common responsibilities."Accordingly, he added, the two sides have agreed to strengthen exchanges and cooperation in economy, trade, environment, education, science and technology, non-proliferation and counter-terrorism among many other fields.During Hu's ongoing state visit, the two countries signed a number of cooperation agreements. "These will inject fresh momentum into our bilateral cooperation and create a great many job opportunities for our two countries," Hu said.He added that he and Obama also discussed some disagreements in the economic and trade area, with both sides pledging "to continue to appropriately resolve these according to the principle of mutual respect and consultation on an equal footing."Commenting on the relations between the countries's armed forces, Hu said, "We believe expansion of military exchanges and cooperation will be conducive to deepening mutual trust between our two countries."On the situation on the Korean Peninsula, he said that both countries agreed to work together with relevant parties to maintain peace and stability on the peninsula, promote denuclearization of the peninsula and achieve lasting peace and security in Northeast Asia.The Chinese leader reaffirmed China's firm commitment to the path of peaceful development and a win-win strategy of opening up, and appreciated Obama's commitment to a positive and constructive China policy."China is a friend and partner of all countries, and China's development is an opportunity for the world," he said.

LOS ANGELES, March 7 (Xinhua) -- U.S. food producer Unilever said on Monday it is recalling two varieties of its Skippy peanut butter because some jars may be contaminated with salmonella.The recall affects jars distributed to retailers in 16 states -- Arkansas, Connecticut, Delaware, Illinois, Iowa, Maine, Minnesota, Missouri, Nebraska, New Hampshire, New Jersey, New York, North Dakota, Pennsylvania, Virginia and Wisconsin, the company said.But the company said no illnesses have been linked to the contaminated Skippy peanut butter.The 16.3-ounce jars are marked with UPC codes 048001006812 and 048001006782 and have Best-If-Used-By Dates of MAY1612LR1, MAY1712LR1, MAY1812LR1, MAY1912LR1, MAY2012LR1 and MAY2112LR1.Unilever advised consumers in a press release to throw away any jars of the recalled peanut butter and to contact the company for a replacement coupon.Salmonella is an organism which can cause serious and sometimes fatal infections in young children, frail or elderly people, and others with weakened immune systems. The most common symptoms are diarrhea, abdominal cramps and fever within eight hours to 72 hours of eating a contaminated product.About 40,000 cases of salmonella are reported each year in the United States, according to the Centers for Disease Control and Prevention.