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WASHINGTON, May 4 (Xinhua) -- The U.S. National Aeronautics and Space Administration (NASA) announced Wednesday that its Gravity Probe B (GP-B) mission has confirmed two key predictions derived from Albert Einstein's general theory of relativity, which the spacecraft was designed to test.The experiment, launched in 2004, used four ultra-precise gyroscopes to measure the hypothesized geodetic effect, the warping of space and time around a gravitational body, and frame- dragging, the amount a spinning object pulls space and time with it as it rotates.GP-B determined both effects with unprecedented precision by pointing at a single star, IM Pegasi, while in a polar orbit around Earth. If gravity did not affect space and time, GP-B's gyroscopes would point in the same direction forever while in orbit. But in confirmation of Einstein's theories, the gyroscopes experienced measurable, minute changes in the direction of their spin, while Earth's gravity pulled at them.The findings are available online in the journal Physical Review Letters."Imagine the Earth as if it were immersed in honey. As the planet rotates, the honey around it would swirl, and it's the same with space and time," said Francis Everitt, GP-B principal investigator at Stanford University. "GP-B confirmed two of the most profound predictions of Einstein's universe, having far- reaching implications across astrophysics research."GP-B is one of the longest running projects in NASA history, with agency involvement starting in the fall of 1963 with initial funding to develop a relativity gyroscope experiment. Subsequent decades of development led to groundbreaking technologies to control environmental disturbances on spacecraft, such as aerodynamic drag, magnetic fields and thermal variations. The mission's star tracker and gyroscopes were the most precise ever designed and produced.GP-B completed its data collection operations and was decommissioned in December 2010."The mission results will have a long-term impact on the work of theoretical physicists," said Bill Danchi, senior astrophysicist and program scientist at NASA Headquarters in Washington. "Every future challenge to Einstein's theories of general relativity will have to seek more precise measurements than the remarkable work GP-B accomplished."

SAN FRANCISCO, April 18 (Xinhua) -- Apple Inc. has sued Samsung Electronics Co. over patent infringement in a latest suit, U.S. media reported Monday.The suit, filed last Friday in U.S. District Court in Northern California, alleged that Samsung's smartphones, such as "Glaxy S 4G" and "Nexus S," and the Galaxy line of tablet computers violated Apple's patent and trademark, according to All Things Digital, a technology and startup company news site."It's no coincidence that Samsung's latest products look a lot like the iPhone and iPad, from the shape of the hardware to the user interface and even the packaging," the report quoted an Apple representative as saying.Intellectual property suits can be often seen among mobile computing rivals, including suits between Microsoft and Motorola, a suit by Oracle against Google, and Apple's patent dispute with Nokia and HTC.Although Samsung supplies chips for a number of Apple products, Apple CEO Steve Jobs once openly mocked Samsung and other tablet makers as "copycats" during the iPad2 launch. Last month, Apple is reportedly partnering with China's Taiwan Semiconductor Manufacturing Co. to make iPad chips.

BEIJING, Jan. 31 (Xinhua) -- Chinese President Hu Jintao and other Party and state leaders have sent greetings to dozens of retired officials ahead of the Spring Festival, according to the General Office of the Central Committee of the Communist Party of China.Former President Jiang Zemin and former Premier Li Peng were on the list of those who received either personal visits from leaders or from representatives, said a statement released by the office on Monday.Hu and the other leaders wished the retired officials good health and long life, said the statement.This year's Spring Festival, or the Chinese New Year, falls on Feb. 3.

BEIJING, Feb. 25 (Xinhua) -- Chinese Vice Premier Li Keqiang on Thursday ordered local governments to increase funding for affordable housing projects, stressing that the construction of 10 million units was a mandatory task that must be fulfilled this year.Speaking at a national conference on affordable housing for low and middle income groups, Li said that the construction of 10 million affordable housing units this year is of great significance for the government to stabilize public expectations, control housing prices, improve people's lives and boost domestic consumption."Housing is imperative for people's lives and local governments must waste no time in beginning the construction of 10 million affordable housing units this year and putting them into service as early as possible," Li said.To facilitate the government's subsidized affordable housing projects, Li said that local governments should ensure basic market supply with small units and guide the public to "reasonable consumption."More efforts are also needed to develop low-rent public housing and satisfy the demands of residents for affordable public housing, Li said. To support the construction of affordable housing, local governments can use tax breaks, determine the rent for public housing reasonably and finance construction projects in different ways, such as bank loans and social investment, he added.Li also called on local governments to increase land supplies for common commercial housing construction. The vice premier called on authorities to ensure transparency and fairness in the distribution of affordable housing units to benefit low-income groups who are in need.He stressed the need to discourage house purchases for the purposes of investment and speculation and to increase the supply of common commercial apartments and strictly implement the central government's macro control policies for the real estate market.The Chinese central government signed strict agreements with provincial governments to guarantee the construction of 10 million government-subsidized apartments this year. The target of building 10 million government-subsidized apartments is 72.4 percent more than last year, according to official figures.China's affordable housing provisions are divided into different categories, including "economic housing" that are sold below market prices, "price-capped housing," government-owned "low-rent housing" for extremely poor residents and "public-rent housing" for a wider range of people.

BRASILIA, March 15 (Xinhua) -- A nationwide program aimed at providing internet access to 80 percent of the country's population by 2014 is forging ahead in Brazil, Communications Minister Paulo Bernardo said on Tuesday.The National Broadband Plan (PNBL), with participation of 13 ministries, is coordinated by Bernardo, who explained details about the project on Tuesday along with Joao Santana, president of Telebras, the state-owned enterprise responsible for managing the project.The authorities have criticized companies that offer internet service for failing to spread internet use in Brazil, offering an expensive service with prices amounting to about 50 U.S. dollars monthly, inaccessible to low-income families."We ended 2010 with 34 percent of Brazilian households with Internet access, and service is also very poor. Almost half of connections are of 256 mbps. We are out-of-date, with the aggravating circumstance that the connections are very expensive," Bernardo said.To speed up the process, the government started negotiating with concessionaire phone companies to improve the service quality and lower the price to about 30 reais (18 dollars), which would allow 80 percent of the population to access internet."During (former president) Lula da Silva's government, we developed a program to interconnect all schools with internet access, but we also want the private sector to do its share," he said.

来源：资阳报