What would it be like to walk on Mars? If you could build the highest building in the world，what would it look like? Do you dream of being the next J. K. Rowling? This summer, you can experience all of these things, and more. All you need is an Internet connection and your imagination.

    A recent study by the Kaiser Family Foundation found that kids spend an average of 1 hour and 29 minutes online each day. Many kids like to use that time to chat with friends, play games or check e­mails. But the next time you get on the Web, try exploring the world instead. “With the Internet，you can go back 11,000 years in time，or go 11,000 kilometers across the planet.” said Russell, Web search expert of Google. “The whole scope of history and the world is open to you.”

    There is a wealth of information to be found online. For example, if your family is going on vacation somewhere, do a quick online search on the area before you even get in the car. “What's the background of the place; what's the history？” says Russell. “I like to tell my kids, ‘Whenever you have a question, whenever you have a doubt, search it out.'”

    Ready to launch a virtual journey of your own? Here are a few starting points to get you thinking and to help you on your way. You can invite your parents along for the ride, too. Always ask for permission before downloading programs and software onto your computer. And check with a parent or an adult before visiting any new Web site.

    Navigate the world in 3­D with Google Earth. Begin in outer space and zoom (快速移动) into the streets of any city, from Hong Kong to San Francisco. Or visit ancient monuments, watch the changing rainforests over time, and dive underwater to explore tropical reef.

    With the Moon in Google Earth tool, you can walk in Neil Armstrong's famous footsteps. Take a guided tour of the moon's surface with Armstrong's fellow shuttle mate astronaut Buzz Aldrin.

    When you're exploring that part of the solar system, hop on over to the Red Planet with Google Mars. There, you can move very quickly around the surface and see images from the Mars Rovers.

    The human body is designed to move. But modern lifestyles and office jobs rarely give us the chance to move around. As we know, we're sitting while we're eating; we sit in the car and we sit while we watch TV. And many of us sit for many hours at work.

    New research shows that sitting less than three hours a day might extend your life by two years. Peter Katzmarzyk, a scientist at the University of Louisiana in the southern United States, says that sitting is ubiquitous in our lives, meaning it is something we do all the time, everywhere.

    However, Mr. Katzmarzyk says that does not mean you can sit for the rest of your waking hours. He also says you may exercise often, "We can't throw away physical activity. It's extremely important. We have 60 years of research showing us that."

    Mr. Katzmarzyk and his colleagues are part of a new generation of researchers studying how sitting all day affects length of life. "Studies that have assessed the relationship between sitting and mortality (死亡率) or television viewing and mortality are very rare. There's only been a few of them, actually five or six now, in the last four or five years." They found that cutting television time to less than two hours a day could add one point four years to life.

    Luckily, change is already coming to some offices, especially in the design of desks. A "standing desk" lets people stand while they work. Another new design is called the "treadmill desk." A treadmill is an exercise machine that lets you walk in one place. Even some U.S. schools are beginning to experiment with desks that are part bicycle to keep children moving. That's one of the strategies that many companies are using now.

    Mr. Katzmarzyk also says studying this problem has inspired his team to make a few changes in their own lives.

    He met her at a party. She was outstanding; many guys were after her, but nobody paid any attention to him. After the party, he invited her for coffee. She was surprised! In order not to appear rude, she went along.

    As they sat in a nice coffee shop, he was too nervous to say anything and she felt uncomfortable. Suddenly, he asked the waiter, "Could you please give me some salt? I'd like to put it in my coffee."

    They stared at him. He turned red, but when the salt came, he put it in his coffee and drank. Curious, she asked, "Why salt with coffee?" He explained, "When I was a little boy, I lived near the sea. I liked playing on the sea. I could feel it salty, like salty coffee. Now every time I drink it, I think of my childhood and my hometown. I miss it and my parents, who are still there."

    She was deeply moved. A man who can admit that he's homesick must love his home and care about his family. He must be responsible. She talked too, about her far away hometown, her childhood, her family. That was the start to their love story.

They continued to date. She found that he met all her requirements. He was kind, warm and careful. She thought she would have missed the catch if not for the salty coffee! So they married and lived happily together. And every time she made coffee for him, she put in some salt, the way he liked it.

    After 40 years, he passed away and left her a letter which said:

    My dearest, please forgive me my life-long lie. Remember the first time we dated? I was so nervous that I asked for salt instead of sugar. Sweetheart, I don't exactly like salty coffee. But as it means so much to you, I've learned to enjoy it. Having you with me was my greatest happiness. If I could live a second time, I hope we can be together again, even if it means that I have to drink salty coffee for the rest of my life.

    It is commonly believed that in medieval France, New Year was celebrated on 1 April. Then in 1562, Pope Gregory introduced a new calendar for the Christian world, changing New Year to 1 January. With no modern communications, news travelled slowly and new ideas were often questioned. Many people did not hear of the change, some merely forgot, and others chose to ignore it. These people were called fools. Invitations to non-existent "New Year" parties were sent and other practical jokes were played. Over time playing tricks on 1 April became a tradition. The custom eventually spread to England and Scotland, and it was later transported across the Atlantic to the American colonies (殖民地) of the English and the French. April Fools' Day has now developed into an international festival of fun, with different nationalities celebrating the day in special ways.

    France and Italy

    In France and Italy, if someone plays a trick on you, you are the "fish of April". By the month of April fish have only just hatched and are therefore easy to catch. Children stick paper fish to their Friends' backs and chocolate fish are found in the shops.

    America and Britain

    Today, Americans and the British play small tricks on friends and strangers alike on 1 April. A common trick is to point to a friend's shoe and say "Your shoelace (鞋带) is untied." When they look down, they are laughed at. Schoolchildren might tell a friend that school has been cancelled. Sometimes the media get involved. Once, a British short film was shown on April Fools' Day about spaghetti farmers and how they harvest their crop from spaghetti trees!

    Scotland

    In Scotland, April Fools' Day lasts for two days! The second day is called "Taily Day" and tricks on this day involve the bottom (or the "tail", in informal speech). Often a sign saying ‘kick me' is stuck onto someone's back without them knowing.

    Facebook was running my life.

    But what killed Facebook for me was when I posted a photo, and five minutes later my son asked me how many "likes" it had got. His question was a wake-up call.

    "Likes" are signs of acceptance and approval(赞同). I had forgotten that acceptance and approval need to come from within and had unknowingly set him a bad example.

    Before absorbed in Facebook, I spent a lot more time reading books and magazines. I checked in with friends through texts, emails and phone calls.

    To set a healthier example to my son, I deactivated my Facebook account.

    I'd been in the habit of checking Facebook many times a day, so I had to come up with some new habits. I carried a novel and a crossword puzzle book around with me. I rediscovered knitting. I started taking yoga classes.

    I started to remember a few things. My body is fine just the way it is. I have friends who will help me out when I'm in trouble, and I will help them out. I do my best to be a good mother, and our son is happy and healthy. We are very lucky to be able to afford two vacations a year.

    I stopped looking at the world through my cellphone. I felt completely present in the moment. The break left me feeling better about myself, my family, my home and my life.

    After a few weeks, I returned to Facebook. Now I look at the photos of my friends' kids growing up and treasure how social media allows me to keep in touch with family. I no longer have the desire to post updates often.

    It is not an addiction(上瘾) any more.

A Wild Child's Guide to Endangered Animals

From New York Times bestselling author Millie Marotta comes this gorgeous celebration of the animal kingdom. Highlighting 43 endangered species, the book takes readers on a trip around the world while learning about rare and well-known animals and their habitats.

Marcovaldo

Marcovaldo is a collection of 20 short stories written by Italo Calvino. Describing the life of a poor rural man living in northern Italy, the stories unfold according to the seasonal cycle of a year. Common themes in the stories include pollution, failure and poverty.

The Art of Mondo

Over the years, Mondo has received global recognition for its incredible art posters that bring to life classic films, television shows, and comics such as Jurassic Park. For the first time, The Art of Mondo brings together this highly sought-after art in one volume that showcases the incredible creativity of the studio's artists whose vastly different styles are united by one guiding principle: limitless passion for their subject matters.

The Coming of the Third Reich

There is no story in 20th-century history more important to understand than Hitler's rise to power and the collapse(坍塌) of civilization in Nazi Germany. The Coming of the Third Reich, by Richard Evans, offers a masterful combination of academic work, important new research and interpretations.

Patriarchy and Capitalism

Chizuko Ueno, a leading Japanese sociologist, feminist critic and public intellectual, has been a pioneer in women's studies and the author of many books, including Patriarchy and Capitalism.