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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.

SAN FRANCISCO, Oct. 14 (Xinhua) -- Google on Friday announced to shut down the highly-controversial social networking product Google Buzz, along with several other services in the coming weeks.On the company's official blog, Google announced the death penalty to its code search engine, Buzz, Jaiku which let users send updates to friends, the Google personalized homepage feature iGoogle, and the University Research Program for Google Search.The shut-downs came as part of Google's housecleaning effort announced in early September, in which the company said it will shut down a number of products and merging others into existing products as features."Changing the world takes focus on the future, and honesty about the past. We learned a lot from products like Buzz, and are putting that learning to work every day in our vision for products like Google+. Our users expect great things from us; today's announcements let us focus even more on giving them something truly awesome," said Google in the blog post.Google Buzz, a social networking and messaging tool integrated into Gmail service, has been widely criticized for privacy concerns and held back the search giant from expanding its businesses to the social networking space.After Buzz, Google launched Google+ in June, which has been receiving a good response and passed the 40 million user mark, the company's chief executive officer Larry Page said Thursday.

TAIYUAN, Jan. 9 (Xinhua) -- China successfully launched the Ziyuan III satellite Monday from the Taiyuan Satellite Launch Center in northern Shanxi province.The satellite, a high-resolution remote-sensing satellite for civilian use, was launched at 11:17 a.m. aboard a Long March 4B rocket, according to a statement from the center.The satellite, weighing 2650 kg, entered an orbit of 500 km above the Earth about 12 minutes after it was launched. It has a designed life expectancy of five years.According to the center, the satellite is tasked with offering services to aid the country's land-resources surveys, natural-disaster prevention, agriculture development, water-resources management, and urban planning.The rocket also carried a satellite from Luxemburg, according to the launch center.The orbiter was developed and produced by the China Academy of Space Technology, a subsidiary of China Aerospace Science and Technology Corporation (CASC).The Long March 4B rocket is developed by Shanghai Academy of Spaceflight Technology, another CASC subsidiary. Monday's mission marked the 156th flight of China's Long March series of carrier rockets.

ISLAMABAD, Oct. 15 (Xinhua) -- President Asif Ali Zardari said on Saturday that the government was committed to address the issues of special people including those afflicted with impaired vision and blindness and called for establishing highest standards for their care.In a message on the International White Cane Safety Day, the President asked the people and relevant government agencies to reflect on the problems of visually handicapped people.He asked them to come up with suggestions to achieve high standards in caring for the disabled as these exist in other civilized nations.The White Cane Safety Day was aimed at creating awareness about the problems and requirements of visually handicapped persons and to take practical steps to address these issues. Enditem

SAN FRANCISCO, Nov. 11 (Xinhua) -- Facebook is close to a settlement with the U.S. Federal Trade Commission (FTC) over the charges that the world's largest social network misled users about its use of their personal information, the U.S. media reported Friday.The proposed settlement would require Facebook to get users' consent before making "material retroactive changes" to its privacy policies, said a report from The Wall Street Journal, citing people familiar with the talks.The agreement with the FTC is also expected to ripple much farther in the tech industry as more companies are developing programs to observe people's online behavior and profiting from the personal information, such as the target advertisements.With a current 800-million-user base worldwide, Facebook changed its user policy in late 2009 to disclose more of users' personal information without adequate notice, leading to a federal investigation along with mounting complaints online.On Thursday, two U.S. representatives asked the Palo Alto, California-based company to explain a February patent application, saying that it raises alarm bells about how the company tracks users on other websites.Outside the U.S., Facebook is also drawing criticism on its privacy policies in countries with strict privacy laws, such as Germany. On Thursday, German authorities said they are considering suing Facebook over its use of facial recognition technology.In a PBS interview aired earlier this week, Facebook's founder and chief executive officer Mark Zuckerberg and chief operating officer Sheryl Sandberg said the company is focused on privacy, addressing that it gives users the ability to protect their privacy.Zuckerberg said Facebook users volunteer all of their personal information on the social network, unlike other Internet giants and advertising networks that compile information "behind your back."