What's your dream vacation? Watching wildlife in Kenya? Boating down the Amazon? Sunbathing in Malaysia? New chances are opening up all the time to explore the world.So we visit travel agents, compare packages and prices, and pay our money.

    We know what our vacation costs us.But do we know what it might cost someone else?It's true that many poorer countries now depend on tourism for foreign income.Unfortunately,though.tourism often harms the local people more than it helps them

    It might cost their homes and lands.In Myanmar.5.200 people were forced to leave their homes among the pagodas(佛塔）in Bagan so that tourists could visit the pagodas.

    Tourism might also cost the local people their livelihood（生计）and dignity（尊严）.Local workers often find only jobs with slim salaries in the tourist industry.And most of the profits（利润）do not help the local economy. Instead,profits return to the tour operators in wealthier countries,When the Maasai people in Tanzania were driven（驱赶）from their lands,some moved to city slums.Others now make a little money selling souvenirs or posing(摆姿势）for photos.

    Problems like these were observed more than 20 years ago.But now some non-government organizations,tour operators and local governments are working together to begin correcting them.Tourists,too,are putting on the pressure.

    The result is responsible tourism,or ethical tourism.Ethical tourism has people at its heart.New international agreements and codes of conduct（行为准则）can help protect the people's lands homes,economies and cultures.The beginnings are small,though,and the problems are complex.

    But take heart. The good news is that everyone,including us,can play a part to help the local people in the places we visit Tour operators and companies can help by making sure that local people work in good conditions and earn reasonable wages.

    They can make it a point to use only locally owned hotel restaurants and guide services.They can share profits fairly to help the local economy And they can involve the local people in planning and managing tourism.

    What can tourists do? First, we can ask tour companies to provide information about the conditions of local citizens.We can then make our choices and tell them why. And while we're abroad, we can: Buy local foods and products, not imported ones.

    Pay a fair price for goods and services and not bargain for the cheapest price.

    Avoid flaunting wealth.

    Ask before talking photographs of people.They are not just part of the landscape!

    Let's enjoy our vacation and make sure others do,too.

    Google's new artificial intelligence can defeat both humans and other AIs. Fortunately, the only war zone where it fights and wins is the ancient board game Go（围棋）.

    AlphaGo Zero, developed by Google-owned DeepMind, is the latest AI program. The original AlphaGo defeated Go master Lee Sedol last year, and AlphaGo Master, an updated version, went on to win 60 games against top human players. What's different about AlphaGo Zero is that it became potentially the world's best Go player without any help from humans.

    The program AlphaGo Zero started off knowing only the basic rules and then played millions of games against itself in just a few days. After almost five million games played against itself, AlphaGo Zero could outplay humans and the original AlphaGo. After 40 days, it was capable of beating AlphaGo Master.

The program learned the strategies humans accumulated over thousands of years in a matter weeks and also developed nontraditional strategies and moves that beat the techniques of the human masters, leaving them astonished. "At each stage of the game, it seems to gain a bit here and lose a bit there, but somehow it ends up slightly ahead, as if by magic," said Andrew Jackson of the American Go Association

    DeepMind says it has plans for the technology behind AlphaGo Zero beyond just defeating all over an ancient game board. "In the end, we want to apply these breakthroughs to helping solve all sorts of pressing real world problems like designing new materials," said Demis Hassabis, co-founder and CEO of DeepMind, in a statement.

    That sounds great, but just as a precaution, let's take the advice of Elon Musk and Stephen Hawking and keep any super-fast learning AI away from the nuclear launch codes for now.

    Sharing E Umbrella, a new umbrella sharing company based in Shenzhen, China, recently announced that it had lost most of the 300, 000 umbrellas since it was set up.

    China's sharing economy has been growing rapidly, with companies offering anything from bicycles and basketballs to phone batteries for people to rent. Customers make a small deposit（押金）and get to use the thing for a daily cost, with a fine put in place for every day if they fail to return the product in time. It's a simple business model, and market data shows that people see sharing as a cheap and convenient way to cut down waste.

    Zhao Shuping founded the Sharing E Umbrella, an umbrella sharing service, in April. By the end of June, he had already started in 11 major Chinese cities, including Shanghai, Nanjing and Guangzhou. While picking up the umbrellas was relatively simple, as they were made available（可得到的）at bus and subway stations, the return system turned out to be a different matter. "Umbrellas are different from bicycles, "Mr. Zhao told Chinese news site ThePaper.cn. "Bikes can be parked anywhere, but with an umbrella you need something to hang it on. "

    So instead of bothering to return the umbrellas back to a station, a lot of people just took them home, and Sharing E Umbrella has reportedly lost track of most of the 300,000 umbrellas. Considering that borrowing umbrellas requires a 19 yuan deposit, with a fee of 0.50 yuan per half an hour usage, Zhao says that he suffers a loss of 60 yuan per lost umbrella, so the company is now in the red, but he is not ready to stop it just yet. Zhao announces that Sharing E Umbrella still plans to roll out（推出）30 million nationwide by the end of the year.

    Back in 1969, it was the Apollo 11 crew who flew to the moon in a spaceship. When U.S. astronauts Neil Armstrong and Edwin “Buzz” Aldrin stepped foot on the moon, they were the first. Meanwhile, their fellow astronaut Michael Coilins circled the moon in their spaceship, named Columbia.

    When Armstrong and Aldrin were done with their walk，they returned to the command module, and back to Earth. That part of the spaceship is on view at the Smithsonian's Air and Space Museum in Washington, D.C. But, if you cannot get to Washington，soon you will be able to see Columbia on your computer or your smartphone.

    Digital scientists are scanning the inside of the spaceship. They are creating an online model, in three dimensions, or“3 D”. By looking at these photographs, you will be able to see outer space，the way the astronauts did. It will be like sitting in their seats.

    Want your very own Columbia spaceship? You will be able to print a 3D copy of Columbia. Experts say anyone can make a life-sized model. But they expect most people to make smaller models of the 320×400 cm(11'X 13')command module.

    Scientists are using special 3D technology to scan the inside. They use cameras on long arms to take the photographs. The thousands of photographs taken will be combined with 50 laser scans.

    What would it be like to sit inside Columbia and take a look around? All the images will be loaded into software that allows you to look around the module on a computer screen. The user will be able to see the Columbia both inside and out. The Smithsonian says that the 3D technology gives the user ways to see things they cannot see at the museum. And it will give information that even the museum curators(馆长)have not seen before.

    “With the Command Module, no one has been inside since it came into the collection,” says Adam Metallo. Smithsonian 3D imaging specialist. “Now the information we capture can give anyone in the world a view of what it looks like inside this incredible piece of history.”

    Going to university is supposed to be a mind-broadening experience. That statement is probably made in comparison to training for work straight after school. But is it actually true? Jessika Golle of the University of Tubingen, in Germany reports in Psychological Science this week that those who have been to university indeed seem to leave with broader and more curious minds than those who have spent their immediate post-school years in vocational (职业的) training for work. However, it was not the case that university broadened minds. Rather, vocational training for work seemed to have narrowed them. The result is not quite what might be expected.

    Dr. Golle came to this conclusion after she and a team of colleagues studied the early careers of 2,095 German youngsters. The team used two standardized tests to assess their volunteers' personality traits (特点) including openness, conscientiousness (认真) and so on, and attitudes such as realistic, investigative and enterprising twice, once towards the end of each volunteer's time at high school, and then again six years later. Of the original group, 382 had to make a choice between the academic and vocational routes, and it was on these that the researchers focused. University beckoned for 212 of them. The remaining 170 chose vocational training and a job.

    When it came to the second round of tests, Dr. Golle found that the personalities of both groups had not changed significantly. As for changes in altitude, again, none were noticeable in the university group. However, those who had chosen the vocational route showed marked drops in interest in tasks that are investigative and enterprising in nature. And that might restrict their choice of careers.

    The changes in attitude that the researchers recorded were more worrying. Vocational training has always been what Germany prides itself on. If Dr Golle is correct, and changes in attitude brought about by the very training are narrowing people's choices that is indeed a matter worthy of serious consideration.

Families with unhealthy diets have worse mental health than those who mostly avoid meals packed with sugar, fat and salt. A new study is the first to show that children's mental health is not immune to what they eat, especially inflammatory (引起炎症的) diets.

The effects of inflammatory diets are putting kids on a path to poor mental health from as young as age 11. The evidence (证据) is now well proved that inflammation in the body is actually damaging bodies gradually and leading to many chronic (慢性的) diseases.

The Murdoch Children's Research Institute (MCRI) looked at the diets and self-reported mental health of more than 1,800 Australian parents and their 11-to-12-year-old children. as well as measuring markers of chronic inflammation in their blood.

The study, published in the British Journal of Nutrition, showed the benefits of healthy eating—namely anti-inflammatory diets high in fruit and vegetables—extended beyond physical health, and that families can eat their way to good mental health.

A child's weight was not an influencing factor. Regardless (不管) of size, the bad effects of inflammatory diets high in processed foods affected children across the board.

Lead researcher at the MCRI, Dr Kate Lycett said while research had shown that specific anti-inflammatory diets could reduce depression symptoms (症状) in adults, people knew little about the effect on children and how a typical family diet—a mix of both inflammatory and anti-inflammatory foods—affected mental health.

"What surprised me was we saw the same results in terms of the risk in children and parents," Dr Lycett said. "That's really important, because as adults we try to control what we eat. We know when we eat a packet of chips we feel sad, but we often don't think about that when we give our kids those chips."