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SAN FRANCISCO, Nov. 3 (Xinhua)-- Amazon on Thursday launched an e-book lending service for owners of its Kindle devices, letting them borrow one digital book per month with no due date.Amazon said Kindle owners with an annual Prime membership can choose from thousands of books to borrow for free, including over 100 current and former New York Times Bestsellers. The online retail giant did not give an exact figure on the number of books of the new service.According to the company, readers' notes, highlights and bookmarks in borrowed books will be saved, so they will have them later if they purchase or re-borrow the book. Customers can have one book out at a time and the borrowed book should be returned through the Kindle device when they want to borrow a new one.In a press release, Amazon said it has reached agreement with publishers for a vast majority of titles for a fixed fee. But in some cases, Amazon is purchasing a title each time it is borrowed by a reader under standard wholesale terms.An Amazon Prime membership costs 79.99 U.S. dollars a year in the United States and gives members free two-day shipping and free access to the company's video streaming service containing some 13, 000 TV shows and movies.The new service is not compatible with smartphones, personal computers or tablet computers from other vendors running with Kindle apps, which makes Amazon's Kindle e-ink readers and its latest low-price tablet Kindle Fire more enticing to customers.According to Amazon, the Kindle Fire, which is priced at 199 U. S. dollars, will be released on Nov. 15.

CANBERRA, Dec. 9 (Xinhua) -- Scientists from Australia's University of New England on Friday said they had discovered the remarkably fossil isa metre-long arthropod with excellent vision called anomalocaris from Emu Bay Shale of South Australia.The scientists reported their finding on the anomalocaris in thescience journal Nature this week.It is reported that anomalocaris is a fearsome ancient predator that swam in the Cambrian oceans 500 million years ago. The researchers said the presence of anomalocaris would have driven the development of protective adaptations in prey animals. Such an escalatory 'arms race' would have seen, for instance, the evolution of such adaptations in prey as shells, camouflage and burrowing into sediments. "It has been unbelievably frustrating being able to see eyes like these at fossil sites like the Burgess Shale (in the Canadian Rocky Mountains), but not have any details. It is really refreshing to have our ideas about these animals confirmed at last, " comments Simon Conway Morris, a palaeontologist at the University of Cambridge, the United Kingdom.The research team was led by paleontologist Dr John Paterson, of the University of New England. He said the most surprising discovery of anomalocaris is the huge number of tiny hardened lenses in each eyes."When you consider that a modern housefly, for example, has about 3000 lenses, it's pretty impressive that an animal half a billion years old already has remarkable vision like this," Paterson said in statement."The fact that each eye in anomalocaris would have had over 16, 000 lenses means it would have very, very good resolution."Paterson said the acute vision of Anomalocaris gave it a distinct advantage over competing predators and prey, as many Cambrian animals either had poor vision or were completely blind. Its acute vision rivals or exceeds that of most living insects and was probably comparable to predatory dragonflies today.He said their findings support the idea that compound eyes evolved very early on in arthropod evolution, before the evolution of jointed legs or hardened exoskeletons.The research team hopes they can find the more fossil remains of Cambrian creatures in the Emu Bay Shale.

BEIJING, Jan. 6 (Xinhua) -- Beijing will offer residents 20,000 rental bikes this year to ease the city's notorious traffic jams, according to authorities with the Beijing Municipal Commission of Development and Reform.Five hundred rental kiosks will be set up around the city to offer residents over 20,000 rental bikes, the commission said.Beijing has also proposed creating new bike lanes in some areas, including main streets, historical and cultural conservation areas and some major business districts, from 2011 to 2015, according to the commission.The capital city currently has about 5 million vehicles on its roads, leading to serious traffic congestion that frustrates the city's residents on a daily basis."A lack of bike lanes is the reason why I refuse to ride a bike. Bikes and vehicles are using the same lanes, and that frightens me and makes me feel unsafe," said Beijing resident Song Tao.People often park cars on the city's existing bike lanes, pushing cyclists onto the vehicles' lanes, said Song.To ease traffic congestion, Beijing has made various efforts to encourage people to opt for modes of public transportation.On Dec. 31, Beijing opened three new subway lines, bringing the number of subway lines in Beijing to 15, with a total length of 372 kilometers, said Beijing Metro Spokesman Jia Peng.Beijing will open four more subway lines in 2012, according to information released at a rail transit construction mobilization conference.Amid other measures to ease traffic in 2011, city authorities decided to allow only 240,000 vehicles to be registered annually, slashing the new car registrations by two-thirds from the 2010 level.Meanwhile, vehicles are banned from roads one day each week according to license plate numbers.

WASHINGTON, Nov. 16 (Xinhua) -- Supervised exercise was shown to be more effective than stenting or medication for improved walking ability in patients with peripheral artery disease (PAD), according to a U.S. study reported Wednesday at the 2011 American Heart Association Scientific Sessions meeting.The research group reported that of 111 patients studied in the randomized trial, the most effective treatment proved to be supervised exercise based on the results of a treadmill test taken at baseline and again at six months. Patients who were in the supervised exercise group improved by a mean of 4.6 minutes in the treadmill test, while the group who received stents improved by a mean of 2.5 minutes. However, researchers found that self-reported quality of life measurements proved to be higher in the group that received stents, even though their ability to walk did not improve as greatly as the group that received supervised exercise rehabilitation.The findings were published in the November issue of the journal Circulation. The researchers believe that more studies are necessary, although supervised exercise may be an effective treatment recommended for PAD patients with claudication.PAD is a condition in which plaque builds up in the arteries and affects blood flow, especially to the legs. It is estimated that between 10 and 12 million people suffer from PAD in the United States. One symptom of PAD is known as claudication, a painful cramping of the leg muscles that limits the patient's ability to walk. It affects nearly 2 million people who suffer from PAD, and results in a sedentary lifestyle and poor quality of life.Current U.S. guidelines for the treatment of claudication include pharmacotherapy, supervised exercise rehabilitation and lower extremity revascularization using stents.

WASHINGTON, Nov. 21 (Xinhua) -- The launch of the Mars Science Laboratory, which contains the car-sized Curiosity rover, has been delayed by a day to Nov. 26, the U.S. National Aeronautics and Space Administration (NASA) announced Monday.The delay will "allow time for the team to remove and replace a flight termination system battery," NASA said in a statement.The launch is now scheduled for 10:02 a.m. (1502 GMT) on Saturday from Cape Canaveral Air Force Station, Florida. The launch window remains open for one hour and 43 minutes.Curiosity is about twice as long and more than five times as heavy as any previous Mars rover. Its 10 science instruments include two for ingesting and analyzing samples of powdered rock delivered by the rover's robotic arm.Scheduled to land on the Mars in August 2012, the one-ton rover will examine Gale Crater during a nearly two-year prime mission. Curiosity will land near the base of a layered mountain three miles (five kilometers) high inside the crater. The rover will investigate whether environmental conditions ever have been favorable for development of microbial life and preserved evidence of those conditions.