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LOS ANGELES, March 3 (Xinhua) -- More and more American adults are suffering from a decline in overall sleep duration, the U.S. Centers for Disease Control and Prevention (CDC) said on Thursday.It's recommended that adults should sleep seven to nine hours a night to maintain good health, but more than one-third of Americans do not meet that requirement, according to the CDC.Insufficient sleep poses a long-term heath threat and impairs work performance and the ability to drive safely, the CDC said.Chronic sleep loss also is associated with obesity, increased risk of death and other health problems, according to the CDC."Over the last 20 years there has been a decline in overall sleep duration in adults," said Lela McKnight-Eily, a clinical psychologist and epidemiologist at the CDC's National Center for Chronic Disease Prevention."Within our culture there seems to be a belief that sleep isn't a part of overall essential health," she said.McKnight-Eily and her colleagues studied the sleep habits of 74,571 adults in 12 states, 35.3 percent reported sleeping less than seven hours.In addition, 48 percent reported snoring, 37.9 percent said they fell asleep at least once during the day the previous month and 4.7 percent admitted to falling asleep at the wheel at least once.Drowsiness or nodding off while driving accounts for 1,550 deaths and 40,000 injuries a year, according to the U.S. Department of Transportation.To get enough sleep, Americans have to change lifestyle habits, including longer workdays and late nights on the computer, McKnight-Eily said, noting that too much screen time paring away much-needed sleep time.

BEIJING, Jan. 20 (Xinhua) -- China's Ministry of Land and Resources announced Thursday illegal buildings totaling 14.31 million square meters in floor space were demolished in an effort to crackdown on illegal use of land by local governments and enterprises.In the crackdown, the ministry also took control of buildings totaling 34.15 million square meters in floor space, and retrieved 43,000 mu of land, 37 percent of which is farm land, said Li Jianqin, an official from the ministry who is charge of enforcing laws and regulations on land use.Li said violations of land-use laws and regulations were widespread, especially those by local governments.According to him, a total of 2,582 people involved in such violations were handed over to judicial and disciplinary authorities in 2010, with 239 people prosecuted for criminal offenses.

CANBERRA, May 27 (Xinhua) -- An Australian student has discovered a part of the universe that astrophysicists have spent decades trying to find, Australia's Monash University on Friday confirmed in a statement.Astrophysicists have long thought the universe has a greater mass than is visible in the planets, but they had no way of proving it is there.Undergraduate student Amelia Fraser-McKelvie, 22, was on a summer internship at Monash University to learn more about astrophysics, when she managed to solve one of the big mysteries of science.Fraser-McKelvie, an aerospace engineering student, conducted a targeted X-ray search for the matter and found evidence of it within three months.Her tutor, Kevin Pimbblet, said the discovery is significant."We've been looking for this ordinary matter for a couple of decades," he said in a statement on Friday."It's been published in one of the most prestigious journals in the world, so astronomers all over the world will be able to read this article."Scientists had thought the matter would have a temperature of about 1 million degrees Celsius, 1.8 million degrees Fahrenheit, and should therefore be observable at X-ray wavelengths.Amelia Fraser-McKelvie's discovery has proved that prediction is correct, Pimbblet said.The trio published a research paper on the missing mass in one of the world's oldest and most prestigious scientific journals, Monthly Notices of the Royal Astronomical Society.He said the discovery could change the way telescopes are built.

KUALA LUMPUR, Feb. 3 (Xinhua) -- Malaysian Prime Minister Najib Razak wishes all Chinese in the world a happy Chinese New Year on Thursday in an exclusive interview with Xinhua News Agency at his official residence in Federal Administrative Center Putrajaya."I would like to wish all Chinese in the world, wherever they are at any part of the world, a very happy Chinese New Year through Xinhua News Agency,"Najib said. "I hope that this new lunar calendar year, the year of the Rabbit will bring much prosperity and will be a successful and productive year."Najib also noted the 36-year-old special ties between Malaysia and China - a relationship which was first established by his father Abdul Razak, the second prime minister of Malaysia.He stressed that Malaysia is determined to forge closer diplomatic relations with China in years ahead."The relationship between Malaysia and China is a very warm and strong relationship that was established way back in 1974, we were the first Southeast Asian to have established diplomatic relations with China," Najib said."Ever since that historic occasion, the relationship between the tow countries has developed from strength to strength and leaps and bounds and today it's the most important relationship that we have," Najib said. "I hope this relationship will bring much benefit to both Malaysia and China, I wish it can be developed further and strengthen and deepen this important relationship."The prime minister had his Thursday occupied, attending numerous Spring Festival Open House, including the one held by the Malaysian Chinese Association (MCA) - the largest party that represents the ethnic Chinese in the country's ruling coalition.Thousands attended the open house event at the party's headquarters, many of whom were tourists.Malaysian leaders, ambassadors and attaches from foreign embassies were among the invited guests at the event.The Open House is a Malaysian tradition during celebrations where people open their doors to welcome guests and even strangers into their homes.He then held a live teleconference with Malaysians residing in seven cities in the world, including Guangzhou, China, and sent his greetings.About 26 percent of Malaysia's 27 million population are ethnic Chinese.

BEIJING, May 25 (Xinhua) -- A researcher with the Chinese Academy of Agricultural Sciences (CAAS) said Wednesday that plant hormones, if used properly, are not a risk to human health."Irregular use of plant growth substances may cause plants to grow excessively fast or affect the taste, but will not cause harm to human health," Ye Zhihua said in an interview with Xinhua.His remarks come after media reports in China about "exploding watermelons," caused by the excessive use of phytohormone, have aroused public concern over the safety of hormones that stimulate plant growth.Ye said plant hormones used to promote growth have the same or similar effects as natural plant hormones, and fruit and vegetables sold at the market carried limited residue of the hormones.More than 100 types of plant hormones, such as ethephon and gibberellin acid, are used in agriculture and forestry sectors around the world, Ye said, adding 38 types of plant hormones have been registered in China.For example, seven plant hormones including thidiazuron and nucleotide are approved for use on cucumbers in China. The purpose is to stimulate the growth of female flowers and increase fruit yields, Ye said.Ye added that China places plant hormones in the category of pesticides control, which means the hormones are subject to strict management from production to utilization.