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DAMASCUS, Sept. 21 (Xinhua) -- The national archeological expedition recently discovered a gigantic building built with large-size hewn stones that date back to the Roman era, Syrian Arab News Agency (SANA) said Wednesday.The building, the thickness of its walls up to 1.5 meters, was found at Qumet Nibal site in the northeastern province of Raqqa, said SANA.Ibrahim Kheir Bek, head of the archeological department in the area, told SANA that the excavation unearthed a 6-meter-long entrance to the building, adding that works are still underway in the site.A day earlier, the national archeological expedition discovered a mosaic dating back to the 6th century A.D. in northeast Syria, SANA said, adding that the rectangular mosaic was found at Hwaija Halawa site on the banks of al-Assad Lake in Raqqa province.Ayham al-Fakhri, head of the national expedition, was quoted by SANA as saying that the expedition uncovered 58 square meters of the mosaic with various colorful geometric shapes.

BEIJING, Sept. 27 (Xinhuanet) -- People having a dog is way healthier than those don't, both physically and mentally, media reports said Tuesday.People owning dogs are more likely to take exercises than those having none, according to a recent poll of Mars Petcare, a pet food company.Two thirds of the walks dog owners take each week are attributed to their dogs, according to the poll, in which over 1,000 adults were surveyed.The survey also showed that 44 percent of dog owners over 65 years old make exercises because of their dogs.Dogs are a great motivator for doing exercises, said Dr. Sandra McCune, an animal behaviorist and also co-author of the book, "The Health Benefits of Dog Walking for People and Pets".

BEIJING, July 11 (Xinhuanet) -- U.S. federal government officially announced that it denied the medical use of marijuana."Department of Health and Human Services concluded that marijuana has a high potential for abuse, has no accepted medical use in the United States, and lacks an acceptable level of safety for use even under medical supervision," U.S. Department of Justice declared Friday.The announcement will keep marijuana in the classification of dangerous, addictive drug as heroin.The decision comes almost nine years after medical marijuana advocates asked the government to reclassify marijuana, as its therapeutic effectiveness in treating some diseases and relieving pain of patients.Joe Elford, the chief counsel for Americans for Safe Access (ASA), said he was not surprised by the government's disapproval."It is clearly motivated by a political decision that is anti-marijuana," He noted.This is the third petition to reclassify marijuana has failed to be approved. The former two were filed in 1972 and in 1995, respectively.

HONG KONG, Sept. 9 (Xinhua) -- The Hong Kong Polytechnic University (PolyU) announced Friday that its surveying experts had successfully developed methodologies for precise mapping of the Moon, after intensive analysis of the data captured by the Chinese lunar orbiter ChangE-1 and other lunar exploration missions.According to the PolyU, the team has made significant contributions to lunar mapping. Their efforts culminated in the development of a unique and innovative approach to the creation of accurate 3D models of the lunar surface.The team has produced the most updated parameters of the lunar figure (the shape of the moon), which is essential for lunar mapping using 17.5 million laser altimetry measurements from the ChangE-1and the Japanese SELENE missions.In addition, they also used the new topographic and gravity models to calculate improved crustal thickness and mass distribution of the Moon and established that the average thickness of the Moon's crust is about 40 km on the near side and 50 km on the far side.It was introduced that the resulting lunar mapping was the hard work of a dedicated research team led by Professor Chen Yong-qi, Emeritus Professor of the Department of Land Surveying and Geo-Informatics, who is also serving on the Expert Committee of China's Lunar Exploration Programme (ECCLEP), with the concerted efforts of team members Prof. Chen Wu, Prof. Ding Xiao-li, Prof. Baki Iz, Dr. Bruce King, and Dr. Wu Bo.According to Chen Yong-qi, the lunar mapping project started in 2006. The primary objective was to develop the methodologies and techniques for mapping the Moon surface, which is much more challenging than mapping the Earth's surface because of very few surveyed control points which are essential for accurate map making.Statistics showed that there were only fourteen lunar laser ranging retro reflectors (LRRR) and Apollo lunar surface experiment package (ALSEP) transmitter sites with accurately known coordinates available only on the near side of the Moon, installed by the U.S. Apollo and former Soviet Union Luna missions in the 1960s.Moreover, according to the team, the gravitational field of the Moon is not as well-known as that of Earth, which means the accuracy of the computed lunar satellite's position at any given time is lower than for Earth satellites, thus degrading the mapping accuracy and reliability.In addition, the team expressed that highly reflective lunar surface created significant problems for the automatic processing of images to develop 3D models using the technique of photogramemtry, which is a widely used and highly reliable technique for the creation of maps and 3D models on Earth.Furthermore, the team also revealed they had a plan to compare such data with other data sources in order to evaluate the performance of the ChangE mapping sensors. Since Chen Yong-qi is serving on the ECCLEP, the team has direct access to more recent data captured by the ChangE satellite.

BEIJING, Aug 4 (Xinhuanet) – A new urine test might help doctors detect prostate cancer and better evaluate a patient's treatment options, according to American reseachers Thursday."This is a tool that men and their physician can use to help them decide whether it's appropriate to get a biopsy now or delay that decision," said lead researcher Dr. Scott Tomlins, a pathology resident at the University of Michigan Health System.The test looks for two genetic markers associated with prostate cancer. The first, called TMPRSS2:ERG, is caused by two genes changing places and fusing together; it is thought to cause prostate cancer. Since the gene fusion is only seen in about half of cancer patients, the test also looks for another marker, called PCA3."We are exploiting some new bio-markers to try to refine the PSA (prostate-specific antigen) test," Tomlins said.