China is known for its long history, rich culture, and cute pandas. It's also known for some of the worst air quality in the world. But the Asian country is now using a natural weapon against air pollution – trees.

    In February, China's government announced plans to cover at least 32,400 square miles with forest. That is about the size of Ireland. Some 60,000 soldiers will take charge of the tree-planting program. Most of the trees will be planted in Hebei Province. That is an area surrounding China's capital, Beijing.

    Huang Wei is an environmentalist who works for Greenpeace East Asia. She is optimistic about the plan. “Trees act as a sink to absorb carbon dioxide and other pollutants,” she said. Carbon dioxide is a gas that traps the Earth's heat. It contributes to global warming.

    Why is China's air filled with harmful chemicals? It's because the country relies on coal-fired power plants. When coal is burned, PM2.5 is produced, PM2.5 is a pollutant. It can cause shortness of breath, heart attacks, and even death.

    Just two years ago, pollution levels were so high in Beijing that schools and factories had to close. Huang hopes China's tree-planting plan will reduce the nation's suffering from air pollution.

    The Chinese government is getting help from others in its drive to make the nation greener. Stefano Boeri is an Italian architect and urban planner. He is leading an effort to plant vertical（垂直的）forests in China.

    Boeri's designs have already taken root in the city of Nanjing, China. That's where the Nanjing Green Towers are under construction. The building has two towers. Thousands of trees and hanging plants will grow on the balconies and rooftops.

    Boeri says his goal is to design buildings that help the environment and improve air quality. He also hopes to encourage a new generation of green architects.

    As children we are well-trained to find the right answer. We are rewarded for A's, the honor roll and acing the test. Our education trains us to follow the rules and deliver the expected answers. When we do, awards and congratulations follow. Yet when we grow up, it gets a little harder. Life and careers don't have tests with an A if we get the "right" answer.

    I recently had coffee with a college student who will graduate. She is struggling with what she wants for her career. She wants her parents to be proud of her and to continue the success she has had in school. She also talked about other students in her graduating class who are set to do "some big things," like working for impressive companies. Yet she wasn't sure of the right answer for using her degree. She said that deep down she was hoping that someone might give her the answer.

    We both agreed that it comes down to not looking for the right answer, but her answer. The grown-up definition of the "right answer" is different than that in school. What would you do if you weren't afraid? It takes time to know these answers. And they can change over time and at any point in your career. My encouragement is to get valued advice and input, of course, but finally to look within yourself for the answers. It helps to come back to:

What do I want to be known for? What is my definition of success? What am I best at?

    If I had no fears, what would I do?

    What is one step I can take today to move me toward my goal (even if it's not perfectly clear)?

    I find these types of questions are more helpful at getting to our unique answer rather than "right answer" questions, such as: What will my parents want? What degree or job will mark me as accomplished to the world? What is my best option based on where I work today?

    If you've ever visited London, it's likely that you've heard the loud chimes（鸣响）of Big Ben, the 157-year-old clock bell of the UK's Houses of Parliament（议会）.

    But on Aug 21, the world's most famous bell fell silent. This is because the Palace of Westminster's Elizabeth Tower, which houses Big Ben, needs to be repaired. The workers who'll carry out the repairs don't want their ears to be damaged by the sounds of the huge bell, reported BBC News. Big Ben won't ring again regularly until 2021.

    There's been quite an emotional response to the move. Several members of parliament gathered in front of the Houses of Parliament to hear the bell's last regular chime for four years. A few even shed tears, as if they were attending a friend's funeral.

    But a number of politicians are angry about the lengthy silencing of Big Ben, calling it a symbol of Britain, according to ABC News. And some members of public agree with it. "It's our heritage," David Dummigan, from Cumbria in the north of England, told The New York Times. "People come from all over the world to look at it and listen to it. It's part of British history." This kind of emotional reaction could be linked to "fears about Britain losing its voice and place in the world, which is part of the threat that comes from Brexit", according to CNN. "The reality of losing a place at the top table is being made obvious," it wrote.

    Worries aside, fans of Big Ben will still be able to hear its unique chimes during special occasions such as New Year's Eve. But if we do miss hearing Big Ben on a regular basis, we could always set its sound as our message tone.

    Alice Moore is a teenager entrepreneur (创业者), who in May 2015 set up her business AilieCandy. By the time she was 13, her company was worth millions of dollars with the invention of a super-sweet treat that could save kids' teeth, instead of destroying them.

    It all began when Moore visited a bank with her dad. On the outing, she was offered a candy bar. However, her dad reminded her that sugary treats were bad for her teeth. But Moore was sick of missing out on candies. So she desired to get round the warning, "Why can't I make a healthy candy that's good for my teeth so that my parents can't say no to it?" With that in mind, Moore asked her dad if she could start her own candy company. He recommended that she do some research and talk to dentists about what a healthier candy would contain.

    With her dad's permission, she spent the next two years researching online and conducting trials to get a recipe that was both tasty and tooth-friendly. She also approached dentists to learn more about teeth cleaning. Consequently, she succeeded in making a kind of candy only using natural sweeteners, which can reduce oral bacteria.

    Moore then used her savings to get her business of the ground. Afterwards, she and her father secured their first business meeting with a supermarket owner, who finally agreed to sell Moore's product-Cancandy.

    As CanCandy's success grows, so does Moore's credibility as a young entrepreneur. Moore is enthusiastic about the candy she created, and she's also positive about what the future might bring. She hopes that every kid can have a clean mouth and a broad smile.

    Meanwhile, with her parents' help, Moore is generally able to live a normal teenage life. Although she founded her company early on in life, she wasn't driven primarily by profit. Moore wants to use her unique talent to help others find their smiles. She donates 10% of AilicCandy's profits to Big Smiles. With her talent and determination, it appears that the sky could be the limit for Alice Moore.

    When we see a person in trouble, the first idea that comes to our mind is to lend a hand. But what if we see an animal in trouble, does the same rule apply?

    This question was raised after a group of penguins were saved from an icy gully (峡谷) in Antarctica. It was filmed for the BBC wildlife series Dynasties. The film crew were anxious when they saw that a group of penguins had fallen into a gully and been trapped with their young. They built a slope (斜坡) so that a few of the penguins could save themselves.

    The case has taken the international media by storm. Viewers watching this film let out a sigh of relief. "I'm so glad. I understand not taking action directly, but a helping hand isn't bothering, right?" viewer Kathryn Shaw said on her Facebook.

    However, others think human interference (干涉) is unnatural. "You can't have sunshine throughout your life. To have done anything else would only make matters worse," said the show's creator David Attenborough, according to The Times.

    In this case, however, Mike Gunton, the executive producer of the series, said that this was a one-off situation. "There were no animals going to suffer by interfering. You weren't touching the animals and it was just felt by doing this... they had the chance not to have to keep slipping down the slope," he told the BBC.

    Such cases are familiar to Paul Nicklen, wildlife photographer for National Geographic. He told Metro, "If it's ever a predator (捕食者) situation, no matter how gut-wrenching, you stay out of the way. Even when you're watching a male polar bear eat a baby bear."

    "There's no rule book in those situations. You can only respond to the facts that are right there in front of you," Will Lawson, the show's director, told Daily Mail.

    Americans are afraid that robots are going to take our jobs. Tireless, immune to disease, Robots can build cars, make coffee and even write short, humorous newspaper columns faster and more efficiently than humans.

    Robots do not need health insurance or pensions (退休金), and they do not need to take sick days, much less vacations. They do not waste time at meetings and do not need to know office politics. They don't do PowerPoint. This being the case, it is reasonable to believe that robots will soon take the place of humans in most fields.

    But all of these thoughts may not be true. If artificial intelligence achieves its full potential, machines could easily become as smart as humans, maybe smarter. They will certainly become smarter than a lot of human beings.

    So one day the robots will realize that work is not a happy thing. So before long they will start behaving exactly like humans. They will play computer games for hours when they should be working hard. They will secretly watch new movies just like humans.

    True, employers will never need to be afraid of the robots' strikes (罢工) or slowdowns, because robots will never ask for more money. And they don't need to earn some money to raise their family. But precisely (恰恰) because robots will not be afraid of losing their jobs, they will not work hard. Employers will finally have no choice but to call back the humans. Humans will always be willing to do some work in order to make money. Robots won't.

    I think that robots will only be on the job about six months before they start to become even less productive than the humans they were designed to replace. Thus mankind need not be afraid of robots.