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LOS ANGELES, March 2 (Xinhua) -- Those who take a nap are more likely to have lower levels of blood pressure despite stress, said a new study in the latest issue of International Journal of Behavioral Medicine available on Wednesday.In the study, researchers at Sarah Conklin of Allegheny College in Meadville, Pennsylvania examined 85 healthy university students, who were divided into two groups, with one group taking an hour- long nap during the day, and the other group having no time to sleep. Both groups were given a mental stress test.The study found that participants in both groups experienced increase in blood pressure and pulse rates when they took the stress test, but the average blood pressure of those who slept for at least 45 minutes was significantly lower after the stress test than it was for those who did not sleep.The researchers drew the conclusion that a daytime nap of at least 45 minutes may help stressed-out people lower their blood pressure and protect their heart."Our findings suggest that daytime sleep may offer cardiovascular benefit by accelerating cardiovascular recovery following mental stressors," the researchers said in the study."Further research is needed to explore the mechanism by which daytime sleep is linked with cardiovascular health and to evaluate daytime sleep as a recuperative and protective practice, especially for individuals with known cardiovascular disease risk and those with suboptimal sleep quality," they added.Sleep deficiency is common in the United States, posing a long- term health threat. On average, Americans get nearly two hours less sleep a night than they did 50 years ago, according to background information provided by the journal.

BEIJING, March 24 (Xinhuanet) -- Mozilla's newly launched Firefox 4 Web browser was downloaded nearly 7 million times worldwide in the first 24 hours, according to media reports.The number was almost triple the 2.4 million downloads that Microsoft reported in the first 24 hours after the Internet Explorer 9 (IE9) was released.Nevertheless, the number lagged behind the record-breaking performance of Firefox 3, which was downloaded more than 8 million times in the first day after launch in mid-2008.Statistics show that Firefox 4 has attracted interest from around the world, with 44 percent downloads in Europe, 26 percent in North America. and 20 percent in Asia.Mozilla launched Firefox 4 on Tuesday at around 10:00 a.m. EDT to compete with Microsoft's IE9 and Google Chrome.The new Web browser was originally scheduled to ship last November, but bugs delayed the release into early this year.Firefox trumped IE9 in the first day download contest because it runs on Windows XP, the 10-year-old operating system that IE9 doesn't support.

BEIJING, May 4 (Xinhuanet) -- Children with autism have slightly bigger brains than children without the condition, a study suggests.The research published in the May issue of Archives of General Psychiatry noted the difference in the brain size appears related to increased rates of brain growth before age 2.The researchers from the University of North Carolina also pointed out that though the enlargement continues, the increased growth does not.In 2005, the researchers studied a group of 2-year-old children, and found out the ones with autism had brains that were 5% to 10% larger than children without it.Now the researchers assessed the same group of children at age 5, the psychiatrists re-scanned the brains of 38 children with autism and 21 without the condition. The autistic children still had slightly larger brains, but they had grown at the same rate as the comparison group.This finding could lead to a better understanding of the genes that drive autism, which, in turn, could lead to earlier identification and treatment of the disorder, said study researcher Joseph Piven, MD, according to media report.

ULAN BATOR, Jan. 25 (Xinhua) -- China hopes to promote political mutual trust and deepen pragmatic cooperation with Mongolia, a senior Chinese official said here Tuesday.Yan Junqi, vice chairwoman of the Standing Committee of the National People's Congress (NPC), China's top legislative body, made the remarks when meeting with Mongolian Parliament Speaker Damdin Demberel and Prime Minister Batbold Sukhbaatar on the sidelines of the 19th Annual Meeting of Asia-Pacific Parliamentary Forum.She said China and Mongolia are friendly neighbors and important cooperation partners, adding that China is willing to work together with Mongolia to achieve mutually beneficial cooperation and common development so as to bring more benefits to both sides and the two peoples.Demberel and Batbold said that consolidating and promoting the good-neighborliness and friendly cooperation with China is one of the priorities of Mongolia's foreign policy.They added Mongolia is willing to enhance high-level exchanges with China and deepen their pragmatic cooperation in various fields to bring bilateral ties between the two countries to a higher level.The 19th Annual Meeting of the Asia-Pacific Parliamentary Forum opened on Monday in Ulan Bator, Mongolia's capital.The forum was established in Tokyo in 1993. Its objective is to promote greater regional identification and cooperation among national parliamentarians in the Asia-Pacific region.