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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, March 22 (Xinhuanet) -- NASA scientists are testing its next-generation Mars rover, which will land on Mars next year, under extreme conditions at space-simulation chamber in California, media reports said Tuesday.Scientists at NASA's Jet Propulsion Laboratory in Pasadena, Calif., say they've installed the Curiosity rover in a space-simulation chamber that can mimic the environment the probe will encounter on Mars.  After the chamber's large door was sealed last week, air was pumped out to near-vacuum pressure, liquid nitrogen in the walls dropped the temperature to minus 130 degrees Celsius, and a bank of powerful lamps simulated the intensity of sunshine on Mars.After the test period, the rover along with other portions of NASA's Mars Science Laboratory spacecraft including the cruise stage, descent stage and backshell -- part of protective covering -- will be shipped to the Kennedy Space Center for final preparation for the launch window from Nov. 25 to Dec. 18, 2011. Curiosity will study whether a selected area of Mars has offered environmental conditions favorable for microbial life and for preserving evidence about whether Martian life has existed.

Google chairman Eric Schmidt has promised that the firm will simplify the process by which Android phone users agree to share their data.It follows questions in the US Senate about how much location information is stored by mobile handsets.Speaking in the UK at a conference on privacy, he also revealed that Google plans to offer web users more control over their online profile.Mr Schmidt insisted that the company took the matter "very seriously".He told attendees at the Big Tent debate in Hertfordshire that his firm was working on "a series of projects" aimed at increasing transparency.Those include a revised Google Dashboard, where users can see what data they have shared with the search giant."It is worth stressing that we can only do this with data you have shared with Google. We can't be a vacuum-cleaner for the whole internet," he said.Mr Schmidt stressed that Google was on the side of consumers when it came to privacy. "In general we take the position that you own your data and should be able to opt in or out of a service," he said.But he added that if users gave consent for sharing data, it would help Google improve its services."If you choose to give us that information we can do a better job. If we know a little bit more about you we can offer better targeted search," he explained.Super injunctions revealed A recent hearing in the US Senate quizzed Google on the amount of data stored on Android handsets. The company argued that it allows people to opt out of location-based services.But Mr Schmidt conceded that the terms and conditions whereby users sign up to services needs to be simplified. "We intent to do that," he said.He predicted that such services would be more heavily regulated in the future.During a lively debate on the issue of privacy, it was revealed to the Big Tent audience, alongside several names of current super-injunction holders, that more data has been collected in the last seven years than in the whole of previous human history.

BEIJING, Feb. 20 (Xinhua) -- China's railways handled 7.13 million passengers Saturday, setting a new one day record, the Ministry of Railways (MOR) said Sunday.The figure was 16 percent higher year on year, the MOR said.Chinese railways are witnessing a new wave of travel after the Lantern Festival celebration (the 15th day of the first month in the Lunar New Year) Thursday, which is considered a symbolic ending of the festival season.China's Spring Festival fell on Feb. 3 this year.The busy Spring Festival transportation season runs for 40 days and is calculated in two phases: 15 days before the Spring Festival and 25 days after the Spring Festival.