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WASHINGTON, Jan. 2 (Xinhua) -- A systematic review of previous studies suggests that there may be a positive connection between physical activity and children's academic performance, according to a report published Monday in the Archives of Pediatrics & Adolescent Medicine.A group of scientists at the Vrije Universiteit (Free University) Medical Center in the Netherlands reviewed evidence on the relationship between physical activity and academic performance because of concerns that pressure to improve test scores may often mean more instructional time for classroom subjects with less time for physical activity.The authors identified 10 observational and four interventional studies for review, 12 of which were done in the United States, one in Canada and one in South Africa. Sample sizes ranged from 53 to about 12,000 participants between the ages of eight years and 18 years old. Follow-up varied from eight weeks to more than five years."According to the best-evidence synthesis, we found strong evidence of a significant positive relationship between physical activity and academic performance. The findings of one high-quality intervention study and one high-quality observational study suggest that being more physically active is positively related to improved academic performance in children," the report said.Background information in the article suggests that exercise may help cognition by increasing blood and oxygen flow to the brain, increasing levels of norepinephrine and endorphin to decrease stress and improve mood, and increasing growth factors that help create new nerve cells and support synaptic plasticity."More high-quality studies are needed on the dose-response relationship between physical activity and academic performance and on the explanatory mechanisms, using reliable and valid measurement instruments to assess this relationship accurately," the report concluded.

BEIJING, Jan. 7 (Xinhua) -- The two-day National Financial Work Conference concluded Saturday, laying out development plans for the financial sector in the coming five years, according to a statement released after the meeting.Chinese Premier Wen Jiabao was present at the conference and delivered a keynote speech.Such a conference is held every five years. Similar meetings were held in 1997, 2002 and 2007.

SAN FRANCISCO, Nov. 4 (Xinhua) -- Google is mulling a plan to offer paid cable-TV services to consumers, a move that could flare up a new wave of competition in the traditional TV business, U.S. media reported on Friday.According to The Wall Street Journal, the Internet search giant has considered adding video and phone services to a previously announced high-speed Internet service in two U.S. cities.People briefed on the plan told the newspaper that Google has discussed distributing major TV channels from companies like Walt Disney, Time Warner and Discovery Communications as part of the video service. The discussions were still exploratory and no final decisions have been made, said the report.Google said it does not comment on rumor or speculation.Whether it is a speculation or not, the reported plan reflects possible innovation and revolution for the traditional TV experience with the growth of high-speed Internet, which may become another lucrative battlefield all the technology giants will fight for.With the growth of home and mobile broadband services, more and more video contents become available for rental, purchase and streaming on desktop computers, tablet computers and smartphones.Competitions on the video streaming market have been increasingly fierce this year, among such services as Apple's iTunes, Amazon's Prime Video, NetFlix, Hulu Plus and Vudu, which is owned by Wal-Mart.Cable companies, facing a grim picture of being kicked out in the decades to come, also fought back with their own mobile apps and online streaming services.A new Steve Jobs biography revealed that the late Apple co- founder had been working on an Apple television."It would be seamlessly synced with all of your devices and with iCloud. It will have the simplest user interface you could imagine. I finally cracked it," Jobs told biographer Walter Isaacson in the book.Some analysts said the introduction of an Apple smart TV could bring a 100-billion-U.S.-dollar revenue opportunity for the Cupertino, California-based company.Last Friday, Google-owned YouTube announced a plan to launch 100 channels on its site with original professionally produced content. A new version of Google TV was also launched with new search tools that expand results from shows on cable to web-based services like NetFlix and Amazon.

BEIJING, Dec. 26 (Xinhua) -- The Standing Committee of the National People's Congress (NPC), China's top legislature, began here Monday to deliberate draft interpretations on two annexes of the Basic Law of the Macao concerning election issues.Li Fei, deputy director of the Commission of Legislative Affairs of the NPC Standing Committee, explained the draft interpretations to lawmakers.The Basic Law of the Macao Special Administrative Region (Macao SAR) was adopted in 1993 and went into effect on Dec. 20, 1999.Annex I to the Basic Law provides a method for selecting the SAR's chief executives while Annex II sets the method for the formation of its legislative assembly.Clause 7 of Annex I of the Basic Law says that if there is a need to amend the method for selecting the Chief Executives for 2009, and the terms subsequent to the year 2009, such amendments must be made with endorsement of a two-thirds majority of all the members of the Legislative Council and the consent of the Chief Executive, and they shall be reported to the Standing Committee of the National People's Congress for approval.Clause 3 of Annex II says that if there is a need to amend the method of forming the Legislative Assembly of the Macao Special Administrative Region in and after 2009, such amendments must be made with the endorsement of a two-thirds majority of all the members of the Assembly and the consent of the Chief Executive, and they shall be reported to the Standing Committee of the National People's Congress for the record.Li said that the phase "if there is a need to amend ..." should mean that they may or may not be amended.The decision-making on whether such necessity exists is reserved to the central authorities, or the NPC standing committee, said Li, adding that the Macao SAR government, rather than members of the Legislative Assembly, individually or jointly, should be the proper entity to propose any such amendments.Li also explained that if no amendment to the methods is adopted, the two Annexes should still apply.The full text of draft has not been made public yet, but the points raised by Li are identical to those in the committee's prior interpretations on Hong Kong SAR's Basic Law in 2004.During the deliberation, members of the committee noted that draft would help to safeguard Macao's long-term prosperity and stability.They also believed that it was "proper and necessary" to adopt the draft during this week's session as Macao's chief executive Fernando Chui Sai On had made the issue of modifying the method a "major work" in his policy address for the fiscal year 2012.Chui's statement recognized that "there is agreement that it is appropriate to properly modify the two methods in order to adapt to society's development and progress" and promised to "submit a proposal on whether to modify and - if so - how to modify the methods."Macao expects the formation of its fifth Legislative Assembly in 2013, and the selection of its fourth Chief Executive in 2014.

SHENYANG, Nov. 17 (Xinhua) -- A MD-90 aircraft left the northeastern city of Shenyang for its American home on Thursday, ending the service of the last McDonnell-Douglas jet for Chinese airlines.Chinese carriers will no longer operate MD-made jets due to growing market demands, said Lu Changchun, deputy general manager with the north China branch of China Southern Airlines, which has operated the MD-90 jet for over a decade.MD-90 jets were involved in no accidents during the decade-long-service in China, so safety concerns did not lead to their retirement, Lu said, adding about 1,000 MD-90 jets are still flying around the world.Lu, however, admitted that supply of aircraft materials was affected as the production line of MD jets shrank, after McDonnell-Douglas Cooperation was merged into Boeing in 1997.MD jets were replaced mainly because Chinese airlines need new models to accommodate air travel demands fueled by the economic boom, Lu said.The north China branch of China Southern Airlines also announced Thursday the retirement of five A300-600R planes, which are replaced by A320 family jets. China Southern Airlines began flying an Airbus A380 superjumbo in China in October.China's domestic air travel market is predicted to grow 13.9 percent annually by 2014 and transport 379 million domestic air passengers, which will make the country the world's second-largest air travel market after the United States, according to a report released by the International Air Transport Association.Back in the 1990s, a Shanghai-based aircraft maker assembled two MD-90 jets in China, Lu said, adding the two jets retired this year.Change of jets model serves the strategic transformation of China Southern Airlines and meets the market demands, Lu said.Li Jiaxiang, chief of China's civil aviation administration, estimated that over 1.5 trillion yuan (235 billion U.S. dollars) will be invested in the civil aviation industry by 2015, adding about 2,000 aircraft to the country's fleet.Commercial Aircraft Corporation of China, producer of China's first self-developed jumbo jet, the C919, has announced that it will complete the design for the passenger plane in 2012. The jet is expected to take off in 2014 and put into service in 2016.

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