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LOS ANGELES, June 3 (Xinhua) -- Eating earth may protect the stomach against toxins, parasites and pathogens, a new study suggests.To examine the possible benefits from eating earth, researchers at Cornell University analyzed reports from missionaries, plantation doctors, explorers, and anthropologists to put together a database of more than 480 cultural accounts of geophagy -- the eating of earth.The database includes as many details as possible about the circumstances under which earth was consumed, and by whom. The researchers could then use patterns in the data to evaluate each potential explanation.Studies in the database indicate that geophagy is common even when food is plentiful. Moreover, when people eat dirt they tend to eat only small quantities that are unlikely to fill an empty stomach.The database shows that geophagy is documented most commonly in women in the early stages of pregnancy and in pre-adolescent children. Both categories of people are especially sensitive to parasites and pathogens, according to the researchers.In addition, geophagy is most common in tropical climates where foodborne microbes are abundant. Finally, the database shows that people often eat earth during episodes of gastrointestinal stress.It's unlikely the intestinal problems are caused by the dirt itself because the type of clay people usually eat comes from deep in the ground, where pathogens and parasites are unlikely to contaminate it. Plus, people usually boil the clay before eating it.More study would be helpful to confirm the protection hypothesis, the researchers say, but the available data at this point clearly support it over the other explanations for eating earth."We hope this paper stimulates (more) research," said Sera Young, a researcher at Cornell University and the study's lead author. "More importantly, we hope readers agree that it is time to stop regarding geophagy as a bizarre, non-adaptive gustatory mistake.""With these data, it is clear that geophagy is a widespread behavior in humans ...that occurs during both vulnerable life stages and when facing ecological conditions that require protection."The study is appearing in the June issue of The Quarterly Review of Biology.

ISLAMABAD, Sept.4 (Xinhua) -- Pakistan's eastern Punjab province is in the grip of a dengue epidemic with dozens of cases being reported daily at various hospitals across the province, said officials and hospital sources.A report issued by the provincial health department on Friday said that as many as 145 cases of dengue fever in Lahore, the provincial capital, and several other cities have been reported in Punjab over the past three days.The total dengue fever cases in the Punjab are 1,419 since the beginning of this year, out of which 1,358 Dengue patients had recovered and been discharged from hospitals, according to local media.Dengue, an acute febrile disease spread by the bite of the aedes aegypti has been endemic in Pakistan for the last few years. It spreads most often after the rainy season in July and August when pools of standing water serve as ideal mosquito breeding spots.Gravity of the dengue disease was felt at the central level and Prime Minister Yusuf Raza Gilani extended full support to the Punjab government in coping with the growing number of cases of dengue fever.The Prime Minister, who was in Lahore on Friday, directed his Principal Secretary to contact the Punjab government and assist them in taking necessary preventive measures against the Dengue fever. He also asked him to extend offer on behalf of the federal government for provision of any technical expertise to the Punjab government.Acting on reports that the virus was spreading rapidly and that measures to control it had been unsuccessful, Punjab Chief Minister Shahbaz Sharif has presided over series of meetings and ordered the immediate suspension of the Lahore district health officer for failing to control the epidemic.A task force comprising a government minister, health officials and doctors has been set up to review the situation and suggest measures to curb the virus.On the orders of the chief minister, giant advertisements on measures that can be taken to prevent dengue have appeared in the media.People have been advised not to allow water to stand in containers, to use mosquito repellents, spray homes and be particularly vigilant at dawn and twilight when the dengue- carrying mosquitoes bite.This increase in public vigilance and awareness may yet halt the spread of a disease that over the past few weeks has struck across the province, said specialists.Meanwhile, the Health Department spokesman also stressed awareness among the people for prevention, control and treatment of dengue virus. According to him, the symptoms of dengue fever include high fever, severe body pain, itching and red spots, bleeding from nose and teeth and severe pain in the eyes. He said precautions include proper covering of the pots having water, like buckets and drums, and using coils, mats and sprays for eliminating mosquitoes.He further said dengue mosquitoes usually attack early in the morning from 6 a.m. to 9 a.m. and from 4 p.m. to 10 p.m.in the evening. The patients should act upon the advice of qualified physicians only, he maintained.

SAN FRANCISCO, June 14 (Xinhua) -- Google on Tuesday introduced several new features of its search services on desktops and smartphones, which the Internet search giant said could help users get to their search results faster.SEARCH BY VOICE, IMAGESpeaking at Google's Inside Search event in San Francisco, Mike Cohen, head of the company's speech technology efforts, said its voice search is now available in 27 languages and dialects, an estimated coverage of around 5 billion people or two-thirds of world population.Voice search has already been available in Google's mobile search application from 2008. Adding the feature to desktops is part of Google's strategy to bring mobile innovations to its desktop search.The voice search on desktop performs similarly to voice search on smartphones -- users can click the microphone button and speak the query. It is only available via Google's Chrome browser for now.Cohen noted that the volume of Google mobile speech inputs has increased by six times in the last year.Also at the event, Google introduced search-by-image, which enables users to drag-and-drop, copy-and-paste image URL, or upload the image from the desktop into the search box. They can also use a Chrome or FireFox software extension to add images to the search.Google said the search-by-image feature will be available in most countries and regions over the next few days to Chrome users, noting that it will not collect and store any images that users use.

SINGAPORE, July 6 (Xinhua) -- A team of researchers in Singapore has designed a tube with special robotic hands that allows doctors to perform surgery on a patient's inner organs without resulting in scars, local media reported on Wednesday.The special "robotic hands" were fixed to the tube to access a patient's stomach. Compared with traditional methods which use only one robotic hand, the new device known as master and slave transluminal endoscopic robot, or MASTER, is more nimble, thereby allowing complex operations, the Lianhe Zaobao reported.Louis Phee, an associate professor at the Nanyang Technological University who led the team of researchers, had spent six years to develop the gadget, which cut an eight-hour procedure to just 17 minutes, said doctors at India's Asian Institute of Gastroenterology.The gadget, still in the trial stage, has been tested earlier this month on three patients at the Indian hospital. It is also expected to be tried out in Germany and China's Hong Kong later. The patients can leave the hospital much sooner than they would have using traditional gadgets.Phee said he expected the gadget to be available on the market as early as three years from now, after going through clinical trials and getting the approval from authorities.He also saw a potential for the gadget to be used on other organs by cutting a small spit on stomach that allows the gadget to go through to access the site.

BEIJING, Sept. 8 (Xinhuanet) -- Middle-aged white women drinking alcohol moderately are more likely to stay healthy than nondrinkers, according to a new study from Harvard.The study has followed about 14,000 mostly white women since 1976.As a result, compared with teetotalers, those who had 3 to 15 alcoholic drinks weekly in their late 50s were 28 percent higher of being free from physical disability, chronic illness, mental health problems, and cognitive decline at the age of 70.Even having just one or two drinks per week increased a woman's odds of good health by 11 percent.However, women should be aware that even moderate drinking has been linked to an increased risk of breast cancer, said Qi Sun, M.D., a lead author of the study and a nutrition researcher at the Harvard School of Public Health.These findings don't necessarily apply to men or to nonwhite women. But they reinforced the evidence for the health benefits of moderate drinking.