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LOS ANGELES, April 8 (Xinhua) -- NASA's Wide-field Infrared Survey Explorer (WISE) has discovered a rare asteroid that traces out a horseshoe shape relative to Earth, the Jet Propulsion Laboratory (JPL) said on Friday.Unlike most near-Earth asteroids (NEAs) that have eccentric, or egg-shaped, orbits that take the asteroids right through the inner solar system, the new object has an orbit that is almost circular such that it cannot come close to any other planet in the solar system except Earth, JPL said.However, even though the asteroid rides around with Earth, it never gets that close, said JPL in Pasadena, Los Angeles.As the asteroid approaches Earth, the planet's gravity causes the object to shift back into a larger orbit that takes longer to go around the sun than Earth. Alternately, as Earth catches up with the asteroid, the planet's gravity causes it to fall into a closer orbit that takes less time to go around the sun than Earth, according to JPL.The asteroid therefore never completely passes our planet. This slingshot-like effect results in a horseshoe-shaped path as seen from Earth, in which the new object, designated 2010 SO16, takes 175 years to get from one end of the horseshoe to the other, JPL said."The origins of this object could prove to be very interesting, " said Amy Mainzer of JPL, the principal investigator of NEOWISE, which is the asteroid- and comet-hunting portion of the WISE survey mission. "We are really excited that the astronomy community is already finding treasures in the NEOWISE data that have been released so far."JPL manages and operates the WISE for NASA's Science Mission Directorate, Washington.

LOS ANGELES, April 29 (Xinhua) -- Clinical and teaching microbiology laboratories are linked with a nationwide salmonella outbreak in the United States that has killed one person and sickened dozens of others, health officials confirmed on Friday.Since August, about 73 people in 35 states have been sickened by salmonella bacteria, and some of those cases involve a strain of Salmonella typhimurium sold commercially to laboratories, officials from the Centers for Disease Control and Prevention (CDC) said in remarks published by msnbc.com.Illnesses have been tied to laboratories from Alaska to New York, with most reporting one or two cases. Five cases have been reported in Washington state and four in Minnesota.The first illness occurred late August and the most recent cases were reported March 8, according to the CDC.The patients include employees and students of the laboratories, as well as children in the homes of people who work or study at the labs.Patients ranged in age from less than one to 91, with a median age of 24, the CDC said.Cases that developed after March 19 may not yet be included in the total because of the lag time in assessing and reporting illness, said the report.CDC officials warned that bacteria used in the labs can be transmitted through contaminated lab coats, pens, notebooks, car keys and other items brought into the labs.The CDC is working with local and state health departments, the American Society for Microbiology and the Association of Public Health Laboratories to track the outbreak, the report said.Salmonella infections typically result in diarrhea, fever and abdominal cramps. They can be dangerous in very young children or people with compromised immune systems.

BEIJING, Feb. 10 (Xinhua) -- China's drought control authorities announced Thursday that hours of snowfall and irrigation have eased to some extent the severe drought in parts of the nation.Rapid spreading of the dry spell in the country's winter wheat producing regions has been curbed by wide-spread snowfall in the areas along the Yangtze, Huaihe and Yellow rivers and in the country's northern part on Wednesday and Thursday, the Office of State Flood Control and Drought Relief Headquarters said in a statement on its website.Drought-hit areas in Henan and Anhui, which are two major wheat-producing provinces, were reduced by 6.3 million mu (420,000 hectares) and 4.1 million mu, respectively, from Wednesday, the statement said. The agency added that irrigation also contributed to easing the effects of the drought.The statement said that as of Thursday, eight drought-hit provinces had irrigated 143 million mu of drought-affected wheat producing areas, which accounts for 52 percent of the combined winter wheat producing areas in the provinces. The eight provinces include the territories of Shandong, Henan, Hubei, Anhui, Shanxi, Shaanxi, Gansu and Jiangsu.As of 3 p.m. Thursday, the drought had affected 101.28 million mu of crops nationwide and left 2.81 million people and 2.57 million heads of livestock short of drinking water, said the statement.Cloud seeding on Wednesday and Thursday during a recent cold front, also helped alleviate drought in some regions, according to a report posted on the website of the China Meteorological Administration on Thursday.The report also said that the artificial precipitation had mitigated the shortage of moisture in the soil in parts of Henan and Anhui. The situation is expected to improve as the rain and snow continues.However, experts urged more measures from local governments to ensure winter wheat production since the current precipitation is not adequate to "completely ease the drought", the report said.

SAN FRANCISCO, May 6 (Xinhua)-- Latest research released Friday shows that Google Android has become the No.1 smartphone platform in the United States in the first quarter as more smartphone manufacturers have adopted the operating system.During the three months ending in March, Google Android grew 6. 0 percentage points to 34.7 percent market share, among the 72.5 million U.S. smartphone users, reported comScore, an Internet marketing research company.The number of smartphone users increased by 15 percent on a quarter-on-quarter basis, said the research.Research in Motion, developer of Blackberry smartphones, ranked second with 27.1 percent, a slide of 4.5 percentage points on a quarter-on-quarter basis. Apple grew 0.5 points to 25.5 percent share, followed by Microsoft (7.5 percent) and Palm (2.8 percent).According to the research, 234 million Americans age 13 and older used mobile devices in the first quarter. Samsung ranked as the top handset maker with 24.5 percent of U.S. mobile subscribers, and LG ranked second with 20.9 percent share, followed by Motorola (15.8 percent) and RIM (8.4 percent). Apple continued to gain share following the launch of the Verizon iPhone, growing by 1.1 percentage points to 7.9 percent of subscribers.On mobile content use, 68.6 percent of U.S. mobile subscribers used text messaging on their mobile device in March. Browsers were used by 38.6 percent of subscribers (up 2.2 percentage points), while downloaded applications were used by 37.3 percent (up 2.9 percentage points).Accessing of social networking sites or blogs increased 2.6 percentage points, representing 27.3 percent of mobile subscribers. Playing games comprised 25.7 percent of the mobile audience, while listening to music represented 17.9 percent, said the report.

BEIJING, Feb. 1 (Xinhua) -- Two Air China passenger planes carrying 457 Chinese citizens stranded in Egypt are due to arrive in Beijing early morning on Wednesday.The planes took off from the Cairo International Airport respectively at 11:16 and 15:32 local time (0916 and 1332 GMT) on Tuesday.The Civil Aviation Administration of China (CAAC), the nation's aviation authority, said Tuesday it was doing its best to organize flights to Egypt to bring home Chinese tourists stranded in the North African nation.China has arranged six flights to fly stranded Chinese nationals home, the CAAC said in a statement posted on its website.