Using technology, of course. While special services via webcam(摄像头) and cheating detecting software have been developed now, Mettl, an online company, has developed advanced techniques for netting cheaters, which the company claims are even more reliable and easier to use. Whatever small attempt to cheat, he or she will be found out.

    Mettl has adopted a handful of technologies on its test—taking platform, creating a mini monitoring state in an exam. Here's how it works: A test-takersigns on to Mettl and selects hisher exam from the site's library of pre—loaded tests. Facial and keystroke recognition technology confirm the person that has signed in is the very person, and the system records both the test—taker(through the webcam)and the test—taker's screen throughout the test.

    Mettl's technology uses the test—taker's webcam to detect how many people are using the computer. Soon, it will track eye movement well enough to sense whether the test-taker is looking away from the screen, perhaps to Consult a smart phone or a friend in secret. Mettl also monitors the test-taker's screen and can detect when the test-taker has changed a computer or moved from the test. The system will soon be able to record sound, thus detecting whether the test-taker is talking or being talked to.

    If any irregularities are detected, the system flags the incident and reports it back to the test's administrator. This can bring any number of things, depending on the test-giver's wishes: a completeshutdown of the exam, a warning message that appears on the test-taker's screen, even human instructions from the control center.

    Mettl is hoping its technology will help it break into the country's big MOOC markets.

    We are all called upon to make a speech at some point in life, but most of us don't do a very good job. This article gives some suggestions on how to give an effective speech.

    So, you have to give a speech and you are terrified. You get nervous, you forget what you want to say, you stumble over words, you talk too long, and you bore your audience. Later you think, “Thank Goodness, it's over. I'm just not good at public speaking. I hope I never have to do that again.”

    Cheep up! It doesn't have to be that bad. Here are some simple steps to take the pain out of speech making. Ask yourself the purpose of your speech. What is the occasion? Why are you speaking? Then, gather as many facts as you can on your subject. Spend plenty of your time doing your research. Then spend plenty of your time organizing your material so that your speech is clear and easy to follow. Use as many examples as possible, and use pictures, charts, and graphs if they help you make your points more clearly. Never forget your audience. Don't talk over their heads, and don't talk down to them. Treat your audience with respect. They will appreciate your thoughtfulness.

    Just remember: Be prepared. Know your subject, your audience, and the occasion. Be brief. Say what you have to say and then stop. And be yourself. Let your personality come through so that you make person-to-person contact with your audience.

    If you follow these simple steps, you will see that you don't have to be afraid of public speaking. In fact, you may find the experience so enjoyable that you volunteer to make more speeches! You're not convinced yet? Give it a try and see what happens.

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    Australia's koalas could die out within 30 years unless immediate action is taken to stop the losing in population, according to researchers. They say development, climate change and bushfires have all combined to reduce the number of wild koalas sharply.

    The Australian Koala Foundation said a recent survey showed the population could have dropped by more than half in the past six years. The number of koalas was once estimated to be more than 100,000, but now is as few as 43,000.

    The foundation collected field data from 1,800 sites and 80,000 trees to calculate the numbers. In one area in northern Queensland estimated to have 20,000 koalas a decade ago, a team of eight people could not find a single animal in four days of searching.

    The foundation said besides problems caused by cutting down forests, hotter and drier conditions because of global warming had reduced the nutritional value of their main food, eucalyptus (桉树) leaves, leading to poor nutrition for them. Koalas, which live in the forests in Australia's east and south, are very picky about what types of the leaves they eat.

    Foundation chief Deborah Tabart said: “The koalas are missing everywhere we look. It's really no tree, no me. If you keep cutting down trees you don't have any koalas.”She is hoping the new figures will persuade the government's Threatened Species Steering Committee (TSSC) to list the koala as threatened. But committee chairman Bob Beeton said a decision was not likely recently and the koala's status as one of the country's favorite animals would not be a factor. “There's a number of species which are attractive and people have special feelings towards them. We don't consider that,” Mr Beeton said.

    Babies made from three people approved in UK

Babies made from two women and one man have been approved by the UK's fertility regulator. The historic and controversial move is to prevent children being born with deadly genetic diseases.

    Doctors in Newcastle - who developed the advanced form of In Vitro Fertilization or IVF (人工授精) - are expected to be the first to offer the procedure and have already appealed for donor eggs. The first such child could be born, at the earliest, by the end of 2017.

    Some families have lost multiple children to incurable mitochondrial (线粒体的) diseases, which can leave people with insufficient energy to keep their heart beating.

The diseases are passed down from only the mother so a technique using a donor egg as well as the mother's egg and father's sperm has been developed.

    The resulting child has a tiny amount of their DNA from the donor, but the procedure is legal and reviews say it is ethical (伦理的) and scientifically ready.

    "It is a decision of historic importance," said Sally Cheshire, chairwoman of the Human Fertilisation and Embryology Authority (HFEA)."I'm sure patients will be really pleased by what we've decided today."

    But some scientists have questioned the ethics of the technique, saying it could open the door to genetically-modified(转基因) 'designer' babies.

    The HFEA must approve every clinic and every patient before the procedure can take place. Three-person babies have been allowed only in cases where the risk of a child developing mitochondrial disease is very high.

    Prof Mary Herbert, from the Newcastle Fertility Centre, said: "It is enormously pleasing that our many years of research in this area can finally be applied to help families affected by these devastating diseases.

    "Now that that we are moving forward towards clinical treatments, we will also need donors to donate eggs for use in treatment to prevent affected women transmitting disease to their children."

    Prof Sir Doug Turnbull, the director of the Wellcome Centre for Mitochondrial Research at Newcastle University, said: "We are delighted by today's decision. We will also provide long-term follow up of any children born."

    NHS England has agreed to fund the treatment costs of the first trial of three-person IVF for those women who meet the HFEA criteria, as long as they agree to long-term follow up of their children after they are born.

    Measles (麻疹) is only found in human beings. There is a highly effective and safe vaccine (疫苗) for the disease. So, in theory, measles could be destroyed.

    Yet the number of measles cases is on the rise.

    The World Health Organization (WHO) reports that, in the first three months of 2019, the number of cases is three times higher than it was last year. Africa alone has had a 700 percent increase compared to last year.

    The Democratic Republic of Congo reported 67,000 measles cases and 901 measles-related deaths in 2018. This year, WHO officials have noted more than 40, 000 suspected measles cases in the country. That number includes 284 measles-related deaths in the first weeks of 2019. Between September 2018 and February 2019, Madagascar reported over 67, 000 measles cases, including 828 deaths.

    Dr. Fauci, who directs the National Institute of Allergy and Infectious Disease in the USA, said that one in 10 children who get infected with measles will get an ear infection that could cause deafness. One in 20 would get pneumonia. One in a thousand would get brain swelling, and one to three per thousand would die. To say that measles is a slight disease is completely incorrect.

    Walter Orenstein is with the Emory University Vaccine Center in Atlanta, Georgia. He has spent his life working to end measles. Orenstein says possible effects of the disease are worse in poor countries. In those countries children are already at greater risk. They may be malnourished (营养不良的). They may have damaged immune systems. They may be underweight and may have no access to health care so measles is a big killer, he said.

    You have a 90 percent chance of getting measles if you have not been vaccinated and you come in contact with someone who has it. Dr. Rebecca Martin is the Director of the Center for Global Health at the U.S. Centers for Disease Control. She is working to remove measles from Africa completely. It is very infectious. It will find nearly everybody who is not protected against measles, Martin said.

    Health experts advise patients to get two treatments of the measles vaccine. U.S. health officials say educating parents about both the disease and the vaccine is an important step in stopping the spread. Equally important is making vaccination a top goal of health systems worldwide.

    China will soon issue licenses for the commercialization(商业化) of 5G, as the country has already established(建立)a competitive advantage in the superfast wireless technology.

    The Ministry of Industry and Information Technology said 5G is entering a critical period of commercial deployment(部署)globally and China's 5G industry has established a competitive advantage through a combination of innovation(创新) and open cooperation.

    Many foreign companies, including Nokia and Intel, have participated in China's technical 5G tests. These foreign companies have already participated in three phases of tests organized by China to get their 5G products and solutions ready for commercial use in the country.

    "With joint efforts of all parties, China has built a foundation for commercialization of 5G," the ministry said, adding it will issue commercial 5G licenses in the near future, a clear sign China will soon officially enter the first year of 5G.

    China's big three telecom carriers are forecast to spend 900 billion to 1.5 trillion yuan ($134 billion to $223 billion) in total on 5G network construction from 2020 to 2025, according to a report from the China Academy of Information and Communications Technology. In comparison, Chinese telecom operators spent 720 billion yuan on 4G network construction from 2014 to 2018.

    In 2019, China Mobile plans to build 30,000 to 50,000 5G base stations this year, while China Telecom is looking to have 20,000.