There have always been a lot of commonly believed but false ideas about being fat and doing exercise. Some people believe that they can't help putting on weight as they get older, while others hold that if they stop exercising, their muscles will turn into fat. Here are some more myths:

I'll never lose weight — I come from a fat family

    Wrong! While we can't change the body type we are born with, we can't blame our genes for making us fat. There's plenty of evidence that fatness runs in families, and the main reason is that they share the same habits of eating too much and exercise too little.

    I am fat because I burn calories slowly

    Wrong! Fatness is not caused by a slow metabolism（新陈代谢）. If fact, although fat people consume more energy that slim people, they also fail to realize how much they eat! Keeping a diary can help you work out your daily food intake more accurately.

    Exercise is boring

    Wrong! Anything will become boring if you do it repetitively. The key is to develop a balanced and varied program that's fun as well as progressive. If you enjoy a Sunday walk, take a different route. If you do Yoga, try a tai chi class. If you like swimming, set yourself a distance or time challenge.

    No pain, no gain

    Wrong! Exercise is not meant to hurt. Indeed, pain is your body telling you something's wrong, and continuing to exercise could lead to serious injury. You may experience mild discomfort as you begin to exercise regularly, but this your body adapting to the positive changes in your lifestyle and the aches should disappear relatively quickly. If you don't, rest and seek medical advice.

    Bad news sells. If it bleeds, it leads. No news is good news, and good news is no news. Those are the classic rules for the evening broadcasts and the morning papers. But now that information is being spread and monitored（监控）in different ways, researchers are discovering new rules. By tracking people's e-mails and online posts, scientists have found that good news can spread faster and farther than disasters and sob stories.

    “The 'if it bleeds' rule works for mass media,” says Jonah Berger, a scholar at the University of Pennsylvania. “They want your eyeballs and don't care how you're feeling. But when you share a story with your friends, you care a lot more how they react. You don't want them to think of you as a Debbie Downer.”

    Researchers analyzing word-of-mouth communication-e-mails, Web posts and reviews, face-to-face conversations-found that it tended to be more positive than negative, but that didn't necessarily mean people preferred positive news. Was positive news shared more often simply because people experienced more good things than bad things? To test for that possibility, Dr. Berger looked at how people spread a particular set of news stories: thousands of articles on The New York Times' website. He and a Penn colleague analyzed the “most e-mailed” list for six months. One of his first findings was that articles in the science section were much more likely to make the list than non-science articles. He found that science amazed Times' readers and made them want to share this positive feeling with others.

    Readers also tended to share articles that were exciting or funny, or that inspired negative feelings like anger or anxiety, but not articles that left them merely sad. They needed to be aroused（激发）one way or the other, and they preferred good news to bad. The more positive an article, the more likely it was to be shared, as Dr. Berger explains in his new book, “Contagious: Why Things Catch On.”

    If you live in Shanghai, Beijing or many other cities, you may see many orange bicycles on the streets these days.

    These bikes are owned by a company called Mobike. You can order a bike through an app on your phone. When you find a bike, you just scan a QR code （扫描二维码） on the bike so you can use it. You don't need to return the bike to a station- you can park it anywhere.

    China was known as "the kingdom of bicycles" about 30 years ago. But more people choose to drive cars and catch the subway these days. Bike rental（租凭的） services like Mobike are bringing bikes back.

    "Back then, I got the feeling that Chinese people were trying to be modern and push away the past. So they did not want to be linked with bicycles," said Ines Brunn, a German woman who runs a bike store in Beijing. "I do believe changes in people's tastes will shape new thinking about bikes."

    Online rental services are making biking more convenient, but it's still not easy to ride bikes in Chinese cities. Cars often take up bicycle lanes （道路）. Bikers have to ride next to cars in car lanes, which can be very dangerous.

    Beijing plans to build over 3,200km of new bike lanes. Drivers who drive in bike lanes will be punished. Traffic signs will be put up to better protect bikers.

    Americans gave nearly $300 billion away last year. Do you know the reason? Beyond the noble goals of helping others, it is that giving will make them happier.

    It is a fact that givers are happier people than non-givers. According to the Social Capital Community Benchmark Survey, a survey of 30,000 American households, people who give money to charity are 43% more likely than non-givers to say they are "very happy" about their lives. Similarly, volunteers are 42% more likely to be very happy then non-volunteers.

    The happiness difference between givers and non-givers is not due to differences in their personal characteristics, such as income or religion. Imagine two people who are identical in terms of income and faith, as well as age, education, politics, sex, and family circumstances, but one donates money and volunteers, while the other does not. The giver will be, on average, over 40 percentage points more likely to be very happy than the non-givers.

    A number of studies have researched exactly why charity leads to happiness. The surprising conclusion is that giving affects our brain chemistry. For example, people who give often report feelings of euphoria, which psychologists have referred to as the "Helper's High". They believe that charitable activity produces a very mild version of the sensations people get from drugs like morphine and heroin.

    Of course, not only does giving increase our happiness, but also our happiness increases the possibility that we will give. Everyone prefers to give more when they are happy. Researchers have investigated this by conducting experiments in which people are asked about their happiness before and after they participate in a charitable activity, such as volunteering to help children or serving meals to the poor. The result is clear that giving has a strong, positive causal impact on our happiness, so does happiness on giving

Photographic self-portraits have existed for as long as cameras have been in human hands. But what about selfies in space? On Twitter last year, NASA astronaut Edwin Aldrin, who famously became the second man to walk on the moon in July 1969, laid claim to a spaceflight first: taking the first selfie in space during the Gemini XII mission in 1966.

"For me, it needs to be digital to be selfie," argues Jennifer Levasseur, a director at the Smithsonian National Air and Space Museum. According to Levasseur, the concept of a selfie is directly linked to internet culture. "The thing that makes a selfie is sharing it," she says.

Still, astronauts have been carrying cameras aboard space vehicles since the 1960s. In 1966, Aldrin used a Hasselblad camera designed specifically for space. Hasselblad also painted the first camera in space a matte(磨砂) black to reduce reflections in the orbiter window. But cameras used in space need to survive extreme conditions, like temperature swings from -149° to 248°F, so Hasselblad painted later model silver.

Astronauts visiting the moon then had to take out the film and leave their camera bodies behind when they returned to Earth, because early space missions were limited by a weight limit on the returned trip. Then a big change in space camera technology came after the space shuttle Columbia broke apart on its return to Earth in 2003, Levasseur notes. "Fear that they'd never be able to bring film back from space and lose all that hard work accelerated the push for digital," she says.

Today, astronauts also have access to internet and social platforms in space and can post true space selfies made using digital cameras. Similarly, space robots are participating in selfie culture, capturing remote pictures of themselves in space or on other planets and sending them back to Earth.

Delicate strokes(笔画), carved onto wood, with ultimate precision. This is woodblock printing, {#blank#}1{#/blank#} ancient printing technique that has promoted human civilization.

Certain people are believed{#blank#}2{#/blank#} (bring) Buddhism into China during the Tang Dynasty (618-907),when there was a strong need to produce a large number of Buddhist scriptures(经文)，and copying by hand could not meet the {#blank#}3{#/blank#} (rise) demand. Ancient Chinese craftsmen thus came up with a novel way to create printed works massively. Hence came the{#blank#}4{#/blank#} (origin) version of woodblock printing.

Traditional woodblock printing can be divided into four major steps: writing, engraving, printing, and binding. With each step then sub-divided into several procedures, {#blank#}5{#/blank#} takes roughly 30 steps to produce a woodblock print. Characters and images{#blank#}6{#/blank#} (carve) to produce raised areas or lines, which calls for skilled hands.

The Buddhist scripture Diamond Sutra, the "earliest dated printed book", can only be seen in the British Library,{#blank#}7{#/blank#} a lot of Chinese treasures are stored. It is just one example of ancient works of art that not only tells the{#blank#}8{#/blank#} (wise) of our ancestors, but also is a witness{#blank#}9{#/blank#} the pursuit of beauty by Chinese craftsmen throughout centuries.

The invention of writing gave life to great thoughts,{#blank#}10{#/blank#} it was the invention of printing that made knowledge a shareable fruit for all humankind.