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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. 5 (Xinhua) -- Apple co-founder and longtime Chief Executive Officer Steve Jobs passed away on Wednesday."Steve died peacefully today surrounded by his family," Jobs' family said in a statement."We are grateful for the support and kindness of those who share our feelings for Steve. We know many of you will mourn with us, and we ask that you respect our privacy during our time of grief," said the statement.Apple's website has changed to "Steve Jobs: 1955-2011," along with the most iconic picture in which the scraggly bearded charismatic visionary posed with one hand up to his chin.Photo taken on Oct. 5, 2011 shows photo of Steve Jobs on the front page of www.apple.com. Apple Board of Directors announced that co-founder and former Chief Executive Officer Steve Jobs passed away on Wednesday"Apple has lost a visionary and creative genius, and the world has lost an amazing human being," the company said in a statement. "Those of us who have been fortunate enough to know and work with Steve have lost a dear friend and an inspiring mentor. Steve leaves behind a company that only he could have built and this spirit will forever be the foundation of Apple."Apple are asking for "thoughts, memories and condolences" to be shared by emailing rememberingsteve@apple.com.Apple Board of Directors also said in a statement that "Steve's brilliance, passion and energy were the source of countless innovations that enrich and improve all of our lives. The world is immeasurably better because of Steve."According to a memo sent by CEO Tim Cook, Apple is planning a celebration of Jobs' life for employees that will take place soon.Jobs took a medical leave of absence earlier this year, the third in his battle with pancreatic cancer that began in 2004. On Aug. 24, he stepped down as Apple CEO, saying "I have always said if there ever came a day when I could no longer meet my duties and expectations as Apple's CEO, I would be the first to let you know. Unfortunately, that day has come."Jobs recommended former CEO Tim Cook take his place as CEO. On Tuesday, Cook gave his first product announcement as CEO unveiling the new iPhone 4S.

BEIJING, Oct. 25 (Xinhua) -- Chinese State Councilor Dai Bingguo said Tuesday that China will unswervingly pursue a path of peaceful development and play a constructive role in the United Nations.Dai made the remarks at a reception commemorating the 40th Anniversary of the restoration of the lawful seat of the People's Republic of China in the United Nations (UN).On Oct. 25, 1971, the 26th Session of the UN General Assembly adopted Resolution 2758 with an overwhelming majority and decided to restore the lawful seat of the People's Republic of China in the UN."This opened a new chapter in the external relations of the People's Republic of China and promoted the friendship and cooperation between China and all countries and peoples who love world peace and justice," Dai said at the reception hosted by the Foreign Ministry in Beijing.It also enhanced the universality, representativeness and authority of the UN and strengthened the forces for world peace and human progress, he added.He said, for the past 40 years, as the largest developing country and a permanent member of the UN Security Council, China has followed the purposes and principles of the Charter of the United Nations, called on countries across the globe to practice tolerance and live together in peace as good neighbors, and made great contributions to world peace, common development and international cooperation.This year marks the beginning of the second decade of the new century, and the world has undergone great, rapid and drastic changes, Dai said."The international community is becoming a global village and countries find interests converging in a scope and depth never seen before," he said, adding that the trend of peace, development and cooperation has gained more popular support, while the international situation remains quite fluid and complex.He said the United Nations, as the most universal, representative and authoritative inter-governmental organization, should seize opportunities and meet challenges in the political, security, economic, development, social, humanitarian, cultural, arms control, and judicial fields, among others, and reinvigorate itself with fresh vigor and vitality."Under the new circumstance, the role of the UN should only be strengthened, rather than weakened, and its authority be upheld, rather than impaired," he said.China has released the White Paper on China's Peaceful Development, which solemnly declared that China will unswervingly pursue the path of peaceful development, he said.China will work actively, through peaceful, open, scientific and common development, to expand international cooperation, take part in international affairs, honor its due international responsibilities and obligations, and play a constructive role in the UN, he said.Dai pledged that China will join other countries to make even greater contributions to building a harmonious world of durable peace and common prosperity and a brighter future for mankind.China's entry to the UN 40 years ago made the international body a more representative international organization, said Kasymzhomart Tokaev, director-general of the UN Office at Geneva.He said China has played an important role in the UN.With the rise of its global status and influence, China, as a major power, will continue to shoulder its responsibility and play a more positive role in creating a more secure, just and peaceful world for future generations, he said.Before the reception, Dai had a brief meeting with Tokaev, exchanging views on the UN's role as well as China's cooperation within the UN.

BEIJING, Jan. 5 (Xinhua) -- Chinese media organizations on Thursday unveiled the top 10 domestic and international news events of 2011.The selection of news events, the eighth of its kind in China, was jointly carried out by 46 major online media providers, including people.com.cn and Xinhuanet.com.The following are the top 10 domestic news events of 2011:-- China launched a series of tough government measures to cool off the property market, including higher mortgage rates, a ban on third-home mortgage loans and purchase restrictions. The State Council, or China's Cabinet, introduced a policy package urging enhanced efforts to ensure the healthy development of the property sector and to promote the construction of affordable housing units for low-income families.-- More than 90 central government departments publicized their 2010 and 2011 spending on government-funded overseas travel, receptions and official cars upon an order issued after an executive meeting of the State Council in May.-- China's amended Criminal Law criminalized all drunk driving incidents starting May 1. The previous law imposed criminal penalties on drunk drivers only when they caused serious traffic accidents.-- Food safety scandals erupted in great number in 2011. Authorities busted farmers for adding clenbuterol, a known carcinogen, to pig feed in order to grow leaner pigs.-- In a speech delivered on July 1 at a ceremony marking the 90th founding anniversary of the Communist Party of China (CPC), Hu Jintao, general secretary of the CPC Central Committee, hailed the Party's achievements and stressed efforts for the future development of the country and the Party.-- On July 23, a high-speed train rammed into a stalled train near the city of Wenzhou in the eastern province of Zhejiang, leaving 40 dead and 191 injured.-- The launch and safe return of the Shenzhou-8 unmanned spacecraft marked the successful completion of China's first space docking mission, with the spacecraft docking with the Tiangong-1 space lab module.-- A gathering was held on Oct. 9 to commemorate the 100th anniversary of China's 1911 Revolution, which ended 2,000 years of imperial rule in the country by toppling the Qing Dynasty.-- The 17th Central Committee of the CPC concluded its sixth plenary session in October, adopting a landmark guideline for improving the nation's cultural soft power and promoting Chinese culture. The CPC Central Committee also pledged enhanced efforts to promote the healthy and positive development of Internet culture.-- Ethics and morality were heavily discussed in the public sphere, with two incidents stoking debate. In July, a woman in east China's city of Hangzhou caught a two-year-old girl who plunged from the window of a 10th-floor apartment, winning praise from people across the country. However, in late August, a bus driver in east China's Jiangsu province stopped to save an old woman who was hit by a three-wheeled vehicle, only to find himself held accountable for the accident.The following are the top 10 international news events of 2011:-- Strong turbulence was encountered by several countries in western Asia and northern Africa.-- On March 11, a 9.0-magnitude earthquake struck Japan and triggered a huge tsunami, killing over 15,000 people and causing radioactive leaks from several reactors at the Fukushima Daiichi nuclear power plant.-- On May 1, U.S. Navy commandos killed al-Qaida leader Osama Bin Laden in a cross-border raid at Abbotabad.-- On July 10, Rupert Murdoch's News International company closed its News of the World tabloid after it was accused of hacking the mobile phones of dead crime victims to access saved messages.-- With the world economy staggering under the European and U.S. debt crises, the Occupy Wall Street movement was launched on Sept. 17, protesting corruption and greed in the financial sector.-- Apple co-founder and longtime Chief Executive Officer Steve Jobs passed away in October at the age of 56 after years of fighting pancreatic cancer.-- On March 19, NATO launched airstrikes in Libya to impose a no-fly zone under a UN Security Council resolution. On Oct. 20, Libya's former leader Muammar Gaddafi was killed as his hometown of Sirte fell to rebel forces.-- A report published by the UN Population Fund showed that the world's population reached 7 billion on Oct. 31, 2011.-- On March 7, U.S. credit rating agency Moody's Investors Service downgraded the credit rating of the Greek sovereign debt to B1, marking the start of the European sovereign debt crisis and worsening the economic situation in the eurozone.-- Kim Jong Il, the top leader of the Democratic People's Republic of Korea (DPRK), died on Dec. 17, 2011 from "a great mental and physical strain."

BEIJING, Jan. 6 (Xinhua) -- China's railways will carry 235 million passengers during the 40-day Spring Festival travel rush, up 6.1 percent year-on-year, the Ministry of Railways said Friday.A daily average of 5.88 million people will make trains trips from Jan. 8 to Feb. 16, the ministry said in a statement on its website.Economic hubs such as Beijing, Guangzhou, Shanghai and Hangzhou and the inland provinces of Sichuan, Hubei, Jiangxi, Anhui and Hunan will see the most activity during the period, as millions of rural migrant workers and students head home for family reunions, according to the statement.The ministry has arranged for extra trains in anticipation of the rush, the statement said, but added that "the conflict remains between passenger demand and railway capacity."Railway authorities have long been under pressure to increase capacity and improve ticketing services, as many citizens find it extremely hard to secure a single ticket during major holidays.The ministry has begun allowing customers to book their tickets online or by phone to ease the ordeal of buying tickets. However, website glitches and the huge demand have rendered the new ways ineffective to many ticket buyers.The Spring Festival, or the Chinese Lunar New Year, falls on Jan. 23.

来源：资阳报