If you could be anybody in the world, who would it be? Your neighbour or a super star? A few people have experienced what it might be like to step into the skin of another person, thanks to an unusual virtual reality（虚拟现实）device. Rikke Wahl, an actress, model and artist, was one of the participants in a body swapping experiment at the Be Another lab, a project developed by a group of artists based in Barcelona. She swapped with her partner, an actor, using a machine called The Machine to Be Another and temporarily became a man. "As I looked down, I saw my whole body as a man, dressed in my partner's pants," she said. "That's the picture I remember best."

    The set-up is relatively simple. Both users wear a virtual reality headset with a camera on the top. The video from each camera is sent to the other person, so what you see is the exact view of your partner. If she moves her arm, you see it. If you move your arm, she sees it.

    To get used to seeing another person's body without actually having control of it, participants start by raising their arms and legs very slowly, so that the other can follow along. Eventually, this kind of slow synchronised（同步的）movement becomes comfortable, and participants really start to feel as though they are living in another person's body.

    Using such technology promises to alter people's behaviour afterwards-potentially for the better. Studies have shown that virtual reality can be effective in fighting racism-the bias（偏见）that humans have against those who don't look or sound like them. Researchers at the University of Barcelona gave people a questionnaire called the Implicit Association Test, which measures the strength of people's associations between, for instance, black people and adjectives such as good, bad, athletic or awkward. Then they asked them to control the body of a dark skinned digital character using virtual reality glasses, before taking the test again. This time, the participants' bias scores were lower. The idea is that once you've "put yourself in another's shoes" you're less likely to think ill of them, because your brain has internalised the feeling of being that person.

    The creators of The Machine to Be Another hope to achieve a similar result. "At the end of body swapping, people feel like holding each other in their arms," says Arthur Pointeau, a programmer with the project. "It's a really nice way to have this kind of experience. I would really, really recommend it to everyone."

    Like all big cities, Paris has a traffic problem: lots of cars, lots of traffic jams and lots of pollution from exhaust fumes (废气). So the city began a project to improve the situation.

    Under the Velib project ('Velib' comes from vélo liberté, or 'bicycle freedom') people can take a bicycle, use it for as long as they want, and then leave it at the same or another bicycle station. The first half-hour on the bike is free, but if you don't return it after 30 minutes, you have to pay. But it's only €1 a day or €29 a year! The bicycles are heavy (25 kg), and they are all grey and have baskets. There are about 20,000 of them in the city, and around 1,450 bicycle stations. So there are a lot more Velib stations than the 298 subway stations!

    Paris is not the first city to have a project like this. But not everybody thinks it's a great idea. One Parisian said, “These bicycles are only for short journeys. If people want to travel across the city, they won't use a bicycle — they'll still use their cars.”

    A city spokesman said, “The bicycle project won't solve all our traffic problems, of course. But it might help reduce air pollution. Traffic, together with factory fumes, is a big problem. There aren't any simple answers to traffic problems and pollution in cities. But unless we do something now, there will be more traffic jams and temperatures will continue to rise, so the problems in our environment will get worse. The bikes might help people to lead a healthier life, too.”

    To fight for the conservation of forest ecosystem, several ecologists including Daniel Janzen convinced Del Oro, an orange juice producer, to donate part of their forestland to a national park. In return, Del Oro was allowed to throw large amounts of waste in the form of orange peels (皮) on a 3-hectare piece of land within the national park at no cost. Dealing with tons of leftover peels usually involved burning them or paying to have them poured into a landfill, so the proposal was very attractive.

    But a year later, another juice company challenged the deal in court, arguing that their competitor was “polluting a national park”. They ended up winning, and the deal between Del Oro and the national park fell through.

    Then in 2013, while discussing possible research avenues with Timothy Treuer, Daniel Janzen mentioned the orange story. Feeling interested, Treuer decided to stop by that piece of land that had been covered with fruit waste 15 years earlier. What he found shocked him.

    “While I would walk over exposed rock and dead grass in the nearby fields, I'd have to climb through undergrowth and cut paths through walls of vines (藤) in the orange peel site itself.” said Timothy Treuer.

    Treuer and his team spent months picking up samples (样品), analyzing and comparing them. They found great differences between the areas covered with orange peels and those that were not. The area with orange waste had richer soil.

    The effect that the orange peels had on the land is probably not that surprising to people familiar with composting (施肥), but what is really shocking is that a judge actually thought the waste of orange “mined” a national park and stopped it from going forward. Now that Timothy Treuer's study has received worldwide attention, this type of “ruining” is being seriously considered as a way of bringing forests back to life.

    This happened when I was ten.

    My girl cousin had decided to be a boy for Halloween, so my aunt called my mom to borrow some of my clothes. The next morning, they came to our house early before school. My cousin told me that she was going to be a boy for Halloween and wear some of my clothes. I told her that I didn't care. Then, with a big grin(咧嘴笑) on her face, she told me that I was going to be a girl. I told her she was crazy but she said that she had overheard my mom's plan and that her mom had brought some of her clothes for me.

    So I went to the living room to see our moms. Then I knew she wasn't lying. There was a wig(假发）on the table and my mom and aunt were both smiling at me. I shook my head and told them “NO WAY!” before they even said a word. My aunt said that it would be really cute. Then Mom told me not to be a stick-in-the-mud. She said that it would be fun and she wanted to see what I'd look like as a little girl. I told them I absolutely would not do it!

    I was still refusing twenty minutes later… when my aunt was putting make-up on me. I was wearing a pink party dress, the blond wig with pigtails(辫子) and earrings. My cousin wore one of my sweatshirts, my jeans and a baseball cap. We were sent to school like that, where I spent a sad day. The kids thought it funny that we were dressed that way and made stupid comments about us. They also played jokes on us and I've never been so uncomfortable.

    I still don't like Halloween to this day!

    Based on the State Information Center (SIC)'s definition for a sharing economy, payment for knowledge can be regarded as a process of turning knowledge into commercial products or services. To be specific, people can share their knowledge with others via Internet platforms, meanwhile bringing themselves extra income. These platforms, at the same time, earn their profits on that.

    The year 2016 marked the beginning of knowledge payment in China. An investigation jointly conducted by Guokr and Netease's online platforms shows that 70% of users have paid for online learning; while in 2015, the number was only 26%.

In May, 2016, Zhihu, a Chinese question-and-answer website, launched Zhihu Live (payment sharing). Within three days, these new platforms attracted over one million users. In June, Luo Zhenyu, founder of LUOgic Show, launched Li Xiang's Commercial References on iget(得到网)，and within two days over four million users subscribed; in August, Z/"7m's approval & tip function, Snowball O&A, Lenovo's Zhiliao Q&A came online; in September, Huxiu (虎嗅网)began to provide in-depth reports to VIP payment members. Other paid knowledge platforms such as Ximalaya FM, Douban，have also been developing their knowledge payment services.

    People with a wealth of knowledge and experience in specific areas are the most likely to benefit from payment for knowledge. Senior managers in large multinational companies like Google, financial elites with top university backgrounds and well-known psychologists, can all profit from these online platforms. But the opportunities also favor the ordinary: a body-builder, a girl who traveled around the world, or a student that passed a postgraduate entry exam can all set up a live classroom. One hundred minutes of audio sharing cost ¥ 19.9 or $2.9, and thousands of users might pay and join the course, bringing those with specific knowledge remarkable income.

    In the 2017 China's Sharing Economy Development Report provided by the SIC，the turnover in China's knowledge market measures about Y61 billion, or $9 billion，which is a 205% growth compared to last year; the number of payment for knowledge users reached 300 million, accounting for half of all Chinese Internet Users.

    The investigation shows that, males are the majority of the users, accounting for nearly 60%: 25-35 year olds account for 59.3%, which mirrors the majority of Internet users, 63% of the paying users are college graduates, and 53.9% of the paying users have an income of Y3-8k,or $ 441-1176, and most are employees and junior management.

    Hipster Greenport: 4 places to eat, shop and visit

    Greenport may date back to the 1630s, but it's feeling pretty of-the-moment right now. Here are four places that embody the old-meets-new energy of the village:

    Claudio's

    If you've been to Greenport, you can't miss Claudio's — it's where generations of Long Islanders have made a tradition of eating, whether inside the main restaurant or at the floating dock-bar. The new owners have added fresh elements: Baccano Pizza by Nino, which offers a variety of slices and pies until as late as 2 a.m. on Fridays and Saturdays — is right by the dock entrance.

    Little Creek Oyster Farm & Market

    It's little spots like this that tell the current Greenport story. There's no sign or advertising for this tiny house changed from the cabin of an old ship that's practically hidden down Bootlegger's Alley near Mitchell Park. But there they are — streams of people who come to enjoy the fresh oysters while drinking local craft beer, with a waterside view.

    The Times Vintage

    Nostalgia (怀旧) for bygone times runs high in this 1909 building, which once served as the base for the Suffolk Times newspaper. These days, this well-designed shop sells vinyl records (黑胶唱片) and loads of old-fashioned clothing and home decoration items including mid-century highball sets.

    Greenport Fire

    Heat comes in many forms and several are sold here — hot sauces, cigars and candles. Consult the chalkboard for the current sauce offerings or browse cigars such as a hand-rolled Honduran Leaf by Oscar or the Gurkha Cellar Reserve made with 18-year-aged tobacco.