October 15^th is the Global Handwashing Day. Activities are planned in more than 20 countries to get millions of people in the developing world to wash their hands with soap. For example, donators (捐赠者) will give 150,000 bars of soap to schools in Ethiopia.

    Experts say people around the world wash their hands every day, but very few use soap at so-called important moments. These include after washing the toilet, after cleaning a baby and before touching food.

    Global Handwashing Day is the idea of the Public-Private Partnership for Handwashing with Soap. Partners include the United Nations Children's Fund, American government agencies, the World Bank and soap makers Unlever and Procter and Gamble. The organizers say all soaps are equally effective at removing disease-causing germs(细菌). They say the correct way to wash is to wet your hands with a small amount of water and cover them with soap. Rub(揉搓) it into all areas, including under the fingernails. Rub for at least twenty seconds. Then rinse well under running water. At last, dry your hands with a clean cloth or wave them in the air.

    The Partnership for Handwashing says soap is important because it increases the time that people spend in washing hands. Soap also helps to break up the dirt that holds most of the germs. And it usually leaves a pleasant smell. The Partnership for Handwashing also says washing with soap before eating or after using the toilet could save more lives than any vaccine(疫苗) or medicine. Hand washing could also prevent the spread of other diseases. When people get germs on their hands, they can infect(感染) themselves by touching their eyes, noses or mouths. Then they can infect others.

    Artificial intelligence (AI) technology may soon be a useful tool for doctors. It may help them better understand and treat diseases like breast cancer in ways that were never before possible.

    Rishi Rawat teaches AI at the University of Southern California's (USC) Clinical Science Center in Los Angeles. He is part of a team of scientists who are researching how AI and machine learning can more easily recognize cancerous growths in the breast. Rawat provides information about cancer cells to a computer. He says this data helps the machine learn. “…You can put the data into them and they will learn the patterns and the pattern recognition that's important to making decisions.”

    David Agus is another USC researcher. He believes that “machines are not going to take the place of doctors.” He adds, “Computers will not treat patients, but they will help make certain decisions and look for things that the human brain can't recognize these patterns by itself.”

    Once a confirmed cancerous growth is removed, doctors still have to treat the patient to reduce the risk of cancer returning. The form of treatment depends on the kind of cancer. Currently, researchers take a thin piece of tissue, put it on a small piece of glass and add color to better see the cells. This process could take days or even longer. Scientists say artificial intelligence can do something better than just count cells. Through machine learning, it can recognize complex patterns, or structures, and learn how the cells are organized. The hope is that machines will soon be able to make a quick diagnosis（诊断）of cancer that is free of human mistakes.

    “All of a sudden, we have the computing power to really do it in real time...We couldn't have done this, we didn't have the computing power to do this several years ago, but now it's all changed.” Agus adds that the process could be done “for almost no cost in the developing world.” He says that having a large amount of information about patients is important for a machine to effectively do its job in medicine.

    A doctor faces a series of critical decisions every day. The best a doctor can do is to make those decisions as informed as possible. Some of them are still hard to make. A doctor can ask people of whom he values their opinions and that's it. Imagine discussing these with an AI system that is even more rational（理性的）than anyone else.

    The University of Southern California researchers are now only studying breast cancer. But doctors predict artificial intelligence will one day make a difference in all forms of cancer.

    A large scale study has found a link between eating a diet based on organic food and having a reduced risk of cancer. If the new results are confirmed, promoting organic food consumption could be a promising preventative strategy against the disease, a team of researchers from several French institutions said.

    Among the environmental risks for cancer, there are growing concerns about exposure to different types of pesticides（杀虫剂） from farming. The impact of such chemicals on the human body is still not well understood but there are some indications that harmful effects can occur even at low concentrations.

    Meanwhile, pushed by environmental and health concerns, the organic food market continues to grow rapidly. Organic food is produced without the use of synthetic（合成的） fertilizers, pesticides, genetically modified organisms, and the use of veterinary（兽医的） medications.

    "Organic foods are less likely to contain pesticide remains than conventional foods, and studies have shown that an organic diet reduces exposure to certain pesticide," Julia Baudry, lead author of the study from the Centre of Research in Epidemiology and Statistics in France, told Newsweek.

    "In the general population, the primary route of exposure is diet, especially intake of conventionally grown fruits and vegetables. However, few studies have examined the association of organic food consumption with cancer risk."

    For the study, published in the journal JAMA Internal Medicine, a team of researchers examined data on the organic food consumption frequency and dietary intake of 68,946 French adults collected by an ongoing survey which began in 2009. They then followed up on these people at various points in the future.

    Participants reported how often （never, occasionally or most of the time） they consumed 16 types of organic foods including fruits, vegetables, soy﹣based products, dairy products, meat and fish, eggs, grains and legumes, bread and cereals, flour, vegetable oils and condiments, ready﹣to﹣eat meals, coffee, tea, and herbal tea, wine, biscuits, chocolate, sugar and so on.

    The earliest known copy of Leonardo da Vinci's Mona Lisa—thought to have been painted at the same time as the original masterpiece—has been discovered at the Prado Museum in Madrid, Spain. The work offers art-lovers an attractive clue to what the model for the world's most famous painting really looked like. Controllers of the museum found the picture hidden beneath layers of paints during restoration work on a picture initially thought to have been a later replica(exact copy) of the Mona Lisa.

    The restored version shows the same woman that Leonardo depicted (描画), against a landscape similar to that shown in the background of the original, which now hangs in the Louvre in Paris. And while the features of Leonardo's Mona Lisa have been dulled by centuries of dirt and layers of cracked paints—which are unlikely ever to be removed—in the recently-rediscovered copy, she appears fresher-faced and younger than her better-known "twin".

    News of the find was revealed at a meeting at London's National Gallery, linked to its "Leonardo da Vinci: Painter at the Court of Milan" exhibition. "This sensational (轰动的) find will transform our understanding of the world's most famous picture," the Art Newspaper reported, adding that the clues found on the Madrid version suggest that the original and the copy were begun at the same time and painted next to each other, as the work went on.

    Miguel Falomir, manager of Italian painting at the Prado, told reporters that expert analysis suggested a strong link between Leonardo and the artist who painted the copy. "The painting was done in the painter's own workshop," he said. "It is absolutely consistent with Leonardo's work, but Leonardo didn't actually do any work on it himself."

    New Jersey Middle School Makes Students Go Phone-Free

    A middle school in Union County, New Jersey, is forcing its students to stay disconnected in class, by prohibiting cellphones. Maxson Middle School Principal Kevin Stansbury put forward the phone ban last week after he noticed some major issues in the school. "Our test scores were down, discipline was up," he says. According to him, students were too focused on their phones to pay attention to their lessons. So, he purchased Yondr pouches for the school.

    Yondr pouch

    When students come into class each morning, they place their phones in the pouch, which is then locked up tight. It can only be opened using a special device at the end of the day. The ban on mobile devices applies not just during class time but during breaks, with the only exceptions being in times of emergency or in cases of students who need such devices to help with disabilities.

    Eighth-graders who spoke with News 12 New Jersey say that they noticed a change in a matter of hours. "It's just better for everyone because you'll understand how it feels to get more work done instead of paying attention to the phone," says student Charlene V. "I'm usually listening to music, but today I got to communicate with all my friends," says student Desiree Duncan.

    The program was originally met with resistance from students and parents, so the process was not that smooth. But teachers and administrators say that the program will have a major impact. "Students were talking and laughing and there were no cellphones other than being carried in the pouches," Stansbury says.

    Teacher Nia Cummings says she even noticed students bouncing ideas off each other in class. She says students used to give up quickly and just look for answers on their phones. She says they now try to figure it out themselves. "Everyone is socializing and eating lunch together. That's what I wasn't seeing enough of when phone usage was at its worst," she adds.

    Maxson Middle School is currently the only one in the district to use these pouches. Kevin Stansbury also called on all the schools in the community that it's worth paying close attention to cellphone issues at secondary schools and taking actions when necessary.