One day, Mr. Arnold was teaching a lesson, and things were going as normally as ever. He was explaining the story of human being to his pupils. He told them that, in the beginning, men were nomads (游牧); they never stayed in the same place for very long. Instead, they would travel about, here and there, in search of food, wherever it was to be found. And when the food ran out, they would move off somewhere else.

    He taught them about the invention of farming and keeping animals. This was an important discovery, because by learning to cultivate (耕作) the land, and care for animals, mankind would always have food steadily. It also meant that people could remain living in one place, and this made it easier to set about tasks that would take a long while to finish, like building towns, cities, and all that were in them. All the children were listening attracted by this story, until Lucy jumped up:

    “And if that was so important and improved everything so much, why are we nomads all over again, Mr. Arnold?”

    Mr. Arnold didn't know what to say. Lucy was a very clever girl. He knew that she lived with her parents in a house, so she must know that her family were not nomads; so what did she mean?

    “We have all become nomads again,” continued Lucy, “The other day, outside the city, they were cutting the forest down. A while ago a fisherman told me how they fish. It's the same with everyone: when there's no more forest left the foresters go elsewhere, and when the fish run out the fishermen move on. That's what the nomads did, isn't it?

    The teacher nodded, thoughtfully. Really, Lucy was right. Mankind had turned into nomads. Instead of looking after the land in a way that we could be sure it would keep supplying our needs, we kept developing it until the land was bare. And then off we would go to the next place! The class spent the rest of the afternoon talking about what they could do to show how to be more civilized (文明的).

    The next day everyone attended class wearing a green T-shirt, with a message that said “I am not a nomad!”

    And, from then on, they set about showing that indeed they were not. Every time they knew they needed something, they made sure that they would get it using care and control. If they needed wood or paper, they would make sure that they got the recycled kind. They ordered their fish from fish farms, making sure that the fish they received were not too young and too small. They only used animals that were well cared for, and brought up on farms.

    And so, from their little town, those children managed to give up being nomads again, just as prehistoric men had done, so many thousands of years ago.

Undersea restaurant Ithaa

    Ithaa is the very first undersea restaurant in the world located 5 meters below sea level in the Republic of Maldives. The 5-by-9-metre restaurant can hold 14 people at a time and has a transparent(透明的) roof offering a 270 panoramic (全景的) underwater view. The restaurant was designed and constructed by M. J. Murphy Ltd., a design consultancy based in New Zealand. It was opened on April 15, 2005. Food served in the restaurant can be described as contemporary （当代的） European with Asian influence.

    Tip: Work on technical designs and drawings for Ithaa started in March 2004. Once constructed, Ithaa would be put into the water. Because of technical challenges, limited resources, and quality control problems in building something underwater, the restaurant can only exist for about 20 years.

Skyline Queenstown Restaurant

    The famous New Zealand restaurant offers delightful fresh seafood, salads, roast meats and delicious desserts, while the panoramic view from the windows will attract you day or night. It' s the ideal place for that special night out and the best place in Queenstown to watch the sun go down! With live music creating a relaxing atmosphere and never ending scenery to admire, you will be entertained as you eat in the restaurant.

    Tip: Unlike other restaurants, the Skyline Queenstown Restaurant has tiered (分层的) seating to guarantee（确保） beautiful lake and mountain views from every table.

Revolving(旋转的) Restaurant Allalin

    Located in the Allalinhom mountain, Saas-Fee, Switzerland, Revolving Allalin is the highest revolving restaurant in the world at about 3,500 m. The restaurant offers a rich selection. Valaisian platter, pasta and pizza ... all this and much more is on the menu of the world-famous restaurant. Enjoy the eating delights offered in the world's highest revolving restaurant, while some mountain tops slowly pass by.

    Tip: Known as the ‘Pearl of the Alps', Saas-Fee offers many sports and activities: The popular holiday village features the Metro Alpine, the highest underground railway in the world up to the skiing area and the highest revolving restaurant at 3,500 m.

    On a Friday night, a poor young artist stood at the gate of the New York railway station, playing his violin. The music was so great that many people stopped to put some money into the hat of the young man.

    The next day, the young artist came to the same place, and put his hat on the ground gracefully. Different from the day before, he took out a large piece of paper and laid it under his hat. Then he began to play the violin. It sounded more pleasant than ever.

    Soon he was surrounded with people who were attracted by the words on that paper. It said, "Last night, a gentleman named George Sang put an important thing into my hat by mistake. Please come to claim（认领）it soon."

    After about half an hour, a middle-aged man rushed through the crowd to the violinist and said, "Yes, it's you. I knew that you were an honest man and would certainly come here." The young violinist asked calmly, "Are you Mr. George Sang?" The man nodded. The violinist asked, "Did you lose something?" "It's a lottery ticket（彩票）," said the man. The violinist took out a lottery ticket on which George Sang's name was seen. "Is it?" he asked. George nodded and took the lottery ticket and kissed it, then danced with the violinist.

    The violinist was a student at an arts college and had planned to attend advanced studies in Vienna. Later his classmate asked the violinist, "At that time you needed money to pay the tuition （学费）and you had to play the violin in the railway station every day to make money. Why didn't you keep the lottery ticket for yourself?" The violinist said, "Although I don't have much money, I live happily. But if I lose honesty I won't be happy forever."

    Through our lives, we can gain a lot and lose so much. But being honest should always be with us.

    Hobbs was an orphan(孤儿). He worked in a factory and every day he got a little money. Hard work changed him thin and weak. He wanted to borrow a lot of money to learn to paint pictures, but he did not think he could pay off the debts.

   One day the lawyer said to him, "One thousand dollars, and here is the money." As Hobbs took the package of notes, he was very dumbfounded (惊呆的). He didn't know where the money came from and how to spend it. He said to himself, "I could go to find a hotel and live like a rich man for a few days; or I give up my work in the factory and do what I'd like to do: painting pictures I could do that for a few weeks, but what would I do after that? I should have lost my place of the factory and have no money to live on. If it were a little less money, I would buy a new coat, or a radio, or give a dinner to my friends. If it were more, I could give up the work and pay for painting pictures. But it's too much for one and too little for the other."

    "Here is the reading of your uncle's will," said the lawyer, "telling what is to be done with this money after his death. I must ask you to remember one point. Your uncle has said you must bring me a paper showing exactly what you did with his money, as soon as you have spent it."

    "Yes, I see. I'll do that." said the young man.

    The young boy saw me, or rather, he saw the car and quickly ran up to me, eager to sell his bunches (串) of bananas and bags of peanuts. Though he appeared to be about twelve, he seemed to have already known the bitterness of life. "Banana 300 naira. Peanuts 200 naira"

    He said in a low voice. I bargained him down to 200 total for the fruit and nuts. When he agreed, I handed him a 500 naira bill He didn't have change, so I told him not to worry.

    He said thanks and smiled a row of perfect teeth.

    When, two weeks later, I saw the boy again, I was more aware of my position in a society where it's not that uncommon to see a little boy who should be in school standing on the corner selling fruit in the burning sun. My parents had raised me to be aware of the advantage we had been afforded and the responsibility it brought to us.

    I pulled over and rolled down my window. He had a bunch of bananas and a bag of peanuts ready. I waved them away. "What's up?" I asked him. "I… I don't have money to buy books for school." I reached into my pocket and handed him two fresh 500 naira bills.

    "Will this help?" I asked. He looked around nervously before taking the money. One thousand naira was a lot of money to someone whose family probably made about 5,000 naira or less each year. "Thank you, sir," he said. 'Thank you very much."

    When driving home, I wondered if my little friend actually used the money for school-books. What if he's a cheat? And then I wondered why I did it. Did I do it to make myself feel better? Was I using him? Later, I realized that I didn't know his name or the least bit about him, nor did I think to ask.

    Over the next six months, I was busy working in a news agency in northern Nigeria. Sometime after I returned, I went out for a drive. When I was about to pull over, the boy suddenly appeared by my window with a big smile ready on his face

    "Oh, gosh! Long time."

    "Are you in school now?" I asked.

    He nodded.

    "That's good," I said. A silence fell as we looked at each other, and then I realized what he wanted. "Here," I held out a 500 naira bill. "Take this." He shook his head and stepped back as if hurt. "What's wrong?" I asked. "It's a gift"

    He shook his head again and brought his hand from behind his back. His face shone with sweat (汗水). He dropped a bunch of bananas and a bag of peanuts in the front seat before he said, "I've been waiting to give these to you."

    Around this time a few years ago, it was common to see videos of friends on social media having a bucket of icy water thrown on them. Known as the "ice bucket challenge", it was created as a way to raise money for the medical condition ALS. But now, there's a new challenge and this time, no water is involved.

    What is it? Well, think of a fruit that you'd never normally sink your teeth into. Perhaps you've got it: a lemon. While we enjoy using lemons to add flavor to dishes, very few of us would actually eat one as we'd eat an apple or an orange.

    But the horrible taste is the precise reason why the "lemon face challenge" is taking off. Participants bite into a lemon, taking a selfie as they do it before posting the photo online. The fun is all about expression people make as all that citric acid(柠檬酸)hits their taste buds(味蕾). Every expression seems to say, "This is worse than freezing water."

    The serious side to this trend is the good cause it's all in aid of. The challenge aims to raise awareness of a rare brain cancer that affects young children. It was started by Aubregh Nicholas, an 11-year-old US kid. She was diagnosed with this rare brain cancer herself in September 2017, but has since raised almost $50000 to cover her medical expenses thanks to the challenge.

    If a challenge is going to raise publicity and contributions from people, it has to be something interesting and original. That way the ice bucket challenge took off in 2014 and it explains why so many people are now sharing their lemon faces. There are a lot of stories about the downside of social media these days. The charity challenges, however, show how online culture can unite the world and bring help to the people who most need it.