First Lady Michelle Obama is a big fan of volunteering. Volunteering means working for free to help someone else. Mrs. Obama says volunteering is very important. “It should be part of everyone's life,” she says.

    Many teens agree. They say that helping others feels great and makes a difference. These days, more teens volunteer than work for pay. Teens clean up parks, walk dogs at animal shelters, visit the elderly and more.

    Some cities —including Seattle, Chicago, and Washington, D.C. —require high school students to volunteer. Students must volunteer in order to graduate. The student volunteers learn new skills and help their communities.

    Many parents are in favor of the idea —they say volunteering helps teens build job skills. But most teens don't want to be forced to volunteer. They say they are busy. And they say volunteering is only fun if it's a choice.

Read both sides of the debate and decide.

YES

Volunteering can help teens get into college or get a job.

Many cities and towns need help. Volunteers can help keep important programs going.

Not all teens will volunteer if it isn' t required. Schools should require students to do all they can to get ready for adult life.

NO

Most teens are already very busy with classes, homework, jobs and sports. Forcing them to do more isn't fair.

It should be up to each person. Helping out doesn't feel as good if you have to do it.

Finding a volunteer job isn't always easy. Students shouldn't be kept from graduating because of something they can't control.

    Where can you go to listen to important people talk about important subjects? BigThink.com is a new website that allows Internet users to discuss certain topics with world experts. Subjects discussed on BigThink include the environment, music and questions about happiness and personal identity. The website has been called a YouTube for thinkers. Victoria Brown and Peter Hopkins created BiThink.com They said that people needed an international place to communicate with each other and discuss the important issues (话题)of our times. On the BigThink website, when you click on (点击)a subject, you will find a video of a person talking about his or her ideas. For example, you can listen to United States Senator Ted Kennedy talking about education and other things. Besides, you can read the comments(评论) and questions written by other visitors to the website. More than one hundred experts have expressed their ideas on the website. BigThink's creators started the website by first getting famous people to agree to be videoed. They began by interviewing several well-known professors from Harvard University. Then they used the names of these professors to gain the trust of others and get them to take part in the project. The website says BigThink belongs to everyone. Its motto(格言) is: "We are what you think." So, go online and start thinking big.

    It's just been three months after the first bike-sharing company arrived in Singapore, but reports of abuse and vandalism（故意破坏）of shared bikes in the city keep appearing on social media.

    The majority of these shared bikes are stationless, which means they don't need to be stopped at a designated（指定的）spot. They lock themselves after your ride is over, and you're meant to just leave the bike at the side of a road.

    But users have been chaining up bicycles outside their apartments, preventing others from using them. Some people bring them up to their apartment floors, so they can't be found easily by other users. Some people have removed the bikes' number plates or codes, and some even have painted over the bikes to claim the bikes for themselves. Most of the abused bikes belong to either Singapore-based oBike, or ofo, a bike-sharing giant based in China.

    ofo has encouraged Singaporean users to report issues. oBike said that the number of bicycles that were damaged made up less than one percent of its fleet. The company said in February that it planned to bring in “tens of thousands” of bikes by mid-2017. The company has yet to ban anyone from its service, but said that it would take appropriate action – including making reports to the police.

    oBike also introduced a shortcoming system, similar to that of its competitor, China-based Mobike. Users start with 100 points, which get taken away for errant（出格的）behaviour such as forgetting to lock the bike, or parking at non-designated areas. Users are banned from using oBike when their scores reach zero. oBike has an eight-man operation team that can remove bicycles parked casually.

    When approached for comment, Mobike said, “In China, just as in Singapore, there are always a tiny minority of people who abuse the bikes, so we designed our system to prevent this type of abuse.”

    It had been some time since Jack had seen the old man. College, career, and life itself got in the way. In fact, Jack moved clear across the country in pursuit of his dreams. There, in the rush of his busy life, Jack had little time to think about the past and often no time to spend with his wife and son. He was working on his future, and nothing could stop him.

    Over the phone, his mother told him, "Mr. Belser died last night. The funeral is Wednesday." Memories flashed through his mind like an old newsreel as he sat quietly remembering his childhood days.

    "Jack, did you hear me?"

    "Oh, sorry, Mom. Yes, I heard you. It's been so long since I thought of him. I'm sorry, but I honestly thought he died years ago." Jack said.

    "Well, he didn't forget you. Every time I saw him he'd ask how you were doing. He'd reminisce (回忆) about the many days you spent over 'his side of the fence' as he put it." Mom told him.

    "I loved that old house he lived in." Jack said.

    "You know, Jack, after your father died, Mr. Belser stepped in to make sure you had a man's influence in your life." she said.

    "He's the one who taught me carpentry. I wouldn't be in this business if it weren't for him. He spent a lot of time teaching me things he thought were important… Mom, I'll be there for the funeral." Jack said.

    Busy as he was, he kept his word. Jack caught the next flight to his hometown. Mr. Belser's funeral was small and uneventful. He had no children of his own, and most of his relatives had passed away.

    The night before he had to return home, Jack and his Mom stopped by to see the old house next door one more time, which was exactly as he remembered. Every step held memories. Every picture, every piece of furniture… Jack stopped suddenly.

    "What's wrong, Jack?" his Mom asked.

    "The box is gone." he said.

    "What box?" Mom asked.

    "There was a small gold box that he kept locked on top of his desk. I must have asked him a thousand times what was inside. All he'd ever tell me was 'the thing I value most'." Jack said.

It was gone. Everything about the house was exactly how Jack remembered it, except for the box. He figured someone from the Belser family had taken it.

    "Now, I'll never know what was so valuable to him," Jack said sadly.

    Returning to his office the next day, he found a package on his desk. The return address caught his attention.

    "Mr. Harold Belser" it read.

    Jack tore open the package. There inside was the gold box and an envelope. Jack's hands shook as he read the note inside.

    "Upon my death, please forward this box and its contents to Jack Bennett. It's the thing I valued most in my life." A small key was taped to the letter. His heart racing, and tears filling his eyes, Jack carefully unlocked the box. There inside he found a beautiful gold pocket watch. Running his fingers slowly over the fine cover, he opened it.

    Inside he found these words carved: "Jack, Thanks for your time! Harold Belser."

    "Oh, My God! This is the thing he valued most…" Jack held the watch for a few minutes, then called his assistant and cleared his appointments for the next two days.

    "Why?" his assistant asked.

    "I need some time to spend with my son." he said.

    In the 1880s, Mark Twain managed his own publishing company. He also became interested in various investments（投资）, especially a kind of typesetting machine. He lost almost $200,000 in investments in the machine between 1881 and 1894. Also, his publishing company declared bankruptcy（破产）in April 1894. Thus, in January 1895, Mark Twain found himself publicly shamed by his inability to pay his debts.

    Mark Twain finally recovered from his financial difficulties, through his continued writing and a successful lecture tour in 1895 and 1896. During this much-publicized tour, Twain lectured in such places as India, South Africa and Australia. By the time he returned, he had become an international hero. Twain enjoyed this attention, and his habits of smoking cigars or a pipe and wearing unusual white suits contributed to his showy image. He also made use of his position as a public figure to criticize the US foreign policy.

    Although he was recovering from his financial problems by 1898, Mark Twain had begun to experience tragedy（悲剧）in his personal life. Suzy, his oldest daughter, died of meningitis （脑膜炎）in 1896, while her parents and sister Clara were abroad. In 1903, Mark Twain sold the beloved house in Hartford, which had become too closely associated with Suzy's death. His wife, Olivia, who had developed a heart condition, died on June 5, 1904. His youngest daughter, Jean, died on Dec.24, 1909.

    If you're short on cash, you don't have to pay for an expensive gym membership to get in shape. Below are some choices for you! And the best is that they don't cost a penny!

    Nike+Running club and Nike+Training Club

    Tuesdays, Wednesdays and Thursdays, various locations Nike's free run club of coaches and pacers open to anyone who wants to learn how to run like the professionals. Besides, there's the Nike Training Club for all health levels, covering boxing and other exercise. It's not one for men, though - the classes have a women-only policy. Call up in advance for participation!

    Our Parks

    Monday, Wednesday and Friday

    This brilliant program works with local communities to bring free health group classes across the city. They're led by qualified instructors and you can join anything from the body-building club at the Olympic Park to yoga in Victoria Park - just remember to register online and book ahead.

    Sweaty Betty's in-store classes

    Daily, various locations and times

    With over 70 classes to pick each week, it's no wonder mums crowd into Sweaty Betty to keep their health. But to sign up for a class, it's fastest fingers first -- places can be booked up to a week in advance so simply register online and watch out for a free spot.

    Sweat Shop running community

    Sundays to Thursdays, various locations and times Running can be a lonely old task. Sweat Shop's run clubs, held at branches across London, aim to make it a little more social. We'd recommend this for more experienced runners - the entry level distance is 5 kilometers - but a pace keeper at the back means you won't be left behind. Ready to work up a good sweat? Just go to the events listed on their Facebook page!