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BEIJING, Sept. 30 (Xinhuanet) -- Tobacco companies concealed the knowledge of radioactive substance in cigarettes from public for over four decades, a new study revealed.The revelation was made by a research team from the University of California, Los Angeles, published on Thursday in the online edition of the U.S. medical journal Nicotine and Tobacco Research.The researchers analyzed 27 timeworn documents and discovered that tobacco companies had knew the existence of polonium-210, a hazardous radioactive substance, in the tobacco since 1959.The companies studied polonium-210 throughout the 1960s, and concealed their findings about the carcinogenic potential of the radioactive substance.Hrayr Karagueuzian, the study's lead author, said the tobacco companies' deception surprised him.According to the revelation, the companies had knew the "cancerous growths" in the lungs of smokers, and even calculated how much radiation a regular smoker would inhale over 20 years.Karagueuzian and his team conducted again the study recorded in the tobacco documents and found that the radiation in cigarettes would cause up to 138 deaths for every 1,000 smokers over a period of 25 years.However, tobacco manufacturer denied that they had concealed the facts from the public.David Sutton, spokesman of Philip Morris, the largest U.S. tobacco company, said the polonium-210 was a "naturally occurring element in the air" and had been widely discussed by the public health community for years.

SANTO DOMINGO, Jan. 11 (Xinhua) -- The Dominican Republic and Haiti Wednesday launched a joint plan aimed at eliminating cholera, which has claimed more than 7,000 lives in both countries since October 2010.The efforts were backed by the World Health Organization (WHO), the Pan American Health Organization (PAHO), and the United Nations International Children's Emergency Fund (UNICEF), Dominican officials said.The plan, "Call to action: the Hispaniola without cholera", aims to improve sanitary and living conditions of the Haiti people who face herculean reconstruction work following a devastating earthquake in the country on Jan. 12, 2010, that killed 220,000 people and displaced over 1 million.Cases of cholera, an infection that causes severe diarrhea that can lead to dehydration and death, first appeared in Haiti in October, 2010.The epidemic has so far killed more than 7,000 people and left nearly 500,000 more sick in Haiti.It also killed 135 people in the Dominican Republic as of September 2011, according to Dominican health authorities.Some 500 million U.S. dollars will be invested in projects related to sanitization and the construction of infrastructure that has to do with waterworks in both nations in the long term.

BEIJING, Nov. 28 (Xinhuanet) -- Scientists in Canada have raised a prospect of reversing Alzheimer's disease by deep brain stimulation, according to media reports Monday.The technique here is known as deep brain stimulation -- applying electricity directly to regions of the brain. It has been used in tens of thousands of patients with Parkinson's as well as having an emerging role in Tourette's Syndrome and depression.The study at the University of Toronto took six patients with the condition. Deep brain stimulation was applied to the fornix -- a part of the brain which passes messages onto the hippocampus.Lead researcher Prof Andres Lozano said you would expect the hippocampus to shrink by five per cent on average in a year in patients with Alzheimer's.After 12 months of stimulation, he said one patient had a five per cent increase and another had an eight per cent increase.Prof Lozano told BBC: "This is the first time that brain stimulation in a human being has been shown to grow an area of your brain.""It was an amazing finding for us," he said.The findings were presented at the Society for Neuroscience conference in November but they have yet to be published in an academic journal.To test whether this is really working, rather than being a fluke result, the researchers are going to perform a larger trial.

SAN FRANCISCO, Oct. 5 (Xinhua) -- Google announced Wednesday that Google Earth, the tech giant's virtual globe, map and geographical information program, has been downloaded more than one billion times since it was first introduced in 2005.According to Google's official blog, there have been more than one billion downloads of the Google Earth desktop client, mobile apps and the Google Earth plug-in. To celebrate the milestone, Google is aggregating all the interesting ways people have used Google Earth around the world and posting them on "www. OneWorldManyStories.com.""We never imagined our geospatial technology would be used by people in so many unexpected ways," said Google in the blog post.Google Earth maps the Earth by images obtained from satellite imagery, aerial photography and GIS (geographic information system) 3D globe. It also has versions of Moon, Mars and Sky, enabling users to see images and videos of the planets and distant galaxies.It is currently available in Google Earth, a free version with limited function, as well as Google Earth Pro and Google Earth Enterprise, subscription services with additional features intended for commercial use.

BEIJING, Nov. 5 (Xinhua) -- China's top political advisor Jia Qinglin's official goodwill visit to Greece, the Netherlands and Germany has deepened the friendship, promoted cooperation and enhanced understanding between China and the three nations, a Chinese official says.The visit was important in further deepening the friendship and mutual trust, promoting pragmatic cooperation and pushing forward the healthy development of relations between China and Europe, said Wang Shenghong, vice secretary general of the National Committee of the Chinese People's Political Consultative Conference (CPPCC).Jia, chairman of the CPPCC National Committee, had in-depth exchanges of views and reached broad consensus with government and parliament leaders of the three countries on issues related to bilateral ties and international and regional issues of common interest, said Wang, who accompanied Jia on the tour from Oct. 23 to Nov. 4.Jia Qinglin (R), chairman of the National Committee of the Chinese People's Political Consultative Conference, meets with Greek President Karolos Papoulias in Athens, Greece, on Oct. 24, 2011.During his visits, Jia also witnessed the signing of 15 inter-governmental agreements and commercial contracts, had extensive contact with people from different walks of life and visited some big-name companies.STRENGTHEN POLITICAL MUTUAL TRUST AND BUILD UP BILATERAL TIESDuring meetings and talks with leaders of the three countries, Jia expressed China's readiness to maintain the high-level exchanges of visits, build up political mutual trust, advance pragmatic cooperation, promote people-to-people and cultural exchanges and strengthen coordination in international affairs, Wang said.Jia said China is ready to work with the three nations to further advance bilateral ties and China-European Union (EU) relations.Greece's government and parliament leaders thanked China for its precious support at a time when Greece is being badly hurt by the financial crisis. Dutch leaders expressed their willingness to strengthen dialogue and cooperation with China in their joint response to the Europe debt crisis and other challenges. And German leaders praised China's positive role in overcoming the effects of the international financial crisis and stabilizing the world economy, Wang said.