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LOS ANGELES, April 20 (Xinhua) -- Hundreds of homes were evacuated on Wednesday in Monument, U.S. state of Colorado after hydrochloric acid was leaking from a train car, authorities said.The leak was first reported around 1 a.m. local time when a southbound train spotted a vapor trail on a northbound train, the Denver Post reported.Authorities first ordered the evacuation of some 255 homes, and later expanded the evacuation to an additional 160 homes, according to the report.Schools in the area were closed due to the leaking, the report said.A specialized crew from Texas has been dispatched to the scene to transfer the hydrochloric acid leaking from the train car and is expected to finish the job in four or five hours, weather permitting, the report quoted Sgt. Mike Schaller of the El Paso County Sheriff's Office as saying.The leak is contained but hydrochloric acid is still leaking slowly from the tanker, which holds 25,000-30,000 gallons, Schaller said.He said police went door-to-door notifying residents of a subdivision adjacent to the railroad tracks to evacuate as a precaution.No injuries have been reported, he said, but residents have been warned that they may have to be out of their homes until Friday as hazardous material crews offload the acid to another container.The northbound train originated in Kansas and was en route to Denver at the time, the Denver Post said.It's not yet known how much hydrochloric acid leaked from the train car.Once the leak is sealed, crews will remove the hydrochloric acid from the damaged car to a new car that will likely continue into Denver, according to the report.Monument is a town of 3,230 residents 88 kilometers south of Denver.

TOKYO, March 20 (Xinhua) -- Traces of radioactive iodine had been detected in Tokyo and the surrounding Kanto region, according to the results of an investigation of radioactivity in precipitation and dust conducted by the government, local media reported on Sunday.Radioactive iodine was found in Tokyo, Saitama, Chiba, Yamanashi, Tochigi and Gunma prefectures, the Kyodo News said, citing the Ministry of Education, Culture, Sports, Science and Technology. The ministry added that the levels detected in the investigation alone would not affect human health.An employee of Yamagata city office holds a Geiger counter to detect radiation when evacuees from the vicinity of Fukushima nuclear plant wish to be screened upon their arrival at an evacuation centre set in a gymnasium in Yamagata, northern Japan March 19, 2011, eight days after Japan's devastating earthquake and tsunami.The investigation was carried out following the nuclear crisis at the Fukushima Daiichi nuclear power plant, the government said Sunday.The ministry said that a separate research has already shown that radioactive materials in the air and tap water in Tokyo and the five prefectures pose no threat to human health, according to Kyodo News report.

LOS ANGELES, May 1 (Xinhua) -- Middle-aged adults who sleep too less or too much may be more likely to suffer cognitive decline, a new study suggests.According to the study, less than six hours of sleep each night is considered too little and more than eight hours as too much for middle-aged adults.The study, conducted by researchers at University College London Medical School, was published May 1 in the American medical journal Sleep.The researchers conducted the study in two periods -- the 1997- 1999 period and the 2003-2004 period. The participants were asked how many hours they slept on an average week night, and were asked the same question in 2003-2004 after an average 5.4 years of follow-up.The researchers compared those who reported changes in their sleep patterns with people whose sleep duration stayed the same over the course of the study.In the follow-up, each individual was given a battery of standard tests to assess his or her memory, reasoning, vocabulary, global cognitive status and verbal fluency.The study findings show that women who slept seven hours per night had the highest score for every cognitive measure, followed by those who had six hours of sleep. For men, cognitive function was similar for those who reported sleeping six, seven or eight hours.However, less than six hours of sleep -- or more than eight hours -- were associated with lower scores."Sleep provides the body with its daily need for physiological restitution and recovery," explained Jane Ferrie, a senior research fellow in the department of epidemiology and public health at the school. "While seven hours a night appears to be optimal for the majority of human beings, many people can function perfectly well on regular sleep of less or more hours."However, since most research has focused on the effects of sleep deprivation on biological systems, it is not yet fully understood why seven hours is optimal -- or why long sleeping appears to be detrimental, Ferrie said."Chronic short sleep produces hormones and chemicals in the body which increase the risk of developing heart disease and strokes, and other conditions like high blood pressure and cholesterol, diabetes and obesity," she added.

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.

LOS ANGELES, April 20 (Xinhua) -- Hundreds of homes were evacuated on Wednesday in Monument, U.S. state of Colorado after hydrochloric acid was leaking from a train car, authorities said.The leak was first reported around 1 a.m. local time when a southbound train spotted a vapor trail on a northbound train, the Denver Post reported.Authorities first ordered the evacuation of some 255 homes, and later expanded the evacuation to an additional 160 homes, according to the report.Schools in the area were closed due to the leaking, the report said.A specialized crew from Texas has been dispatched to the scene to transfer the hydrochloric acid leaking from the train car and is expected to finish the job in four or five hours, weather permitting, the report quoted Sgt. Mike Schaller of the El Paso County Sheriff's Office as saying.The leak is contained but hydrochloric acid is still leaking slowly from the tanker, which holds 25,000-30,000 gallons, Schaller said.He said police went door-to-door notifying residents of a subdivision adjacent to the railroad tracks to evacuate as a precaution.No injuries have been reported, he said, but residents have been warned that they may have to be out of their homes until Friday as hazardous material crews offload the acid to another container.The northbound train originated in Kansas and was en route to Denver at the time, the Denver Post said.It's not yet known how much hydrochloric acid leaked from the train car.Once the leak is sealed, crews will remove the hydrochloric acid from the damaged car to a new car that will likely continue into Denver, according to the report.Monument is a town of 3,230 residents 88 kilometers south of Denver.