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.

    Living and dealing with kids can be a tough job these days, but living and dealing with parents can be even tougher.

    If I have learned anything in my 16 years, it is that communication is very important, both when you disagree and when you get along. With any relationship, you need to let other person know how you are feeling. If you are not able to communicate, you drift apart. When you are mad at your parents, or anyone else, not talking to them doesn't solve anything.

    Communication begins with the concerns of another. It means that you can't just come home from school, go up to your room and ignore everyone. Even if you just say “Hi”, and see how their day was for five minutes, it is better than nothing.

    If you looked up the word “communication” in a dictionary, it would say “the exchange of ideas, the conveyance （表达）of information, correspondence （通信）, means of communication: a letter or a message”. To maintain (保持) a good relationship, you must keep communication strong. Let people know how you feel, even if it's just by writing a note.

    When dealing with parents, you always have to make them feel good about how they are doing as a parent. If you are trying to make them see something as you see it, tell them that you'll listen to what they have to say, but ask them politely to listen to you. Yelling or walking away only makes the situation worse.

    This is an example: one night, Sophie went to a street party with her friends. She knew she had to be home by midnight after the fireworks, but she didn't feel she could just ask to go home. That would be rude. After all, they had been nice enough to take her along with them. Needless to say, she was late getting home. Her parents were mad at first, not when Sophie explained why she was late, they weren't as mad and let the incident go. Communication is the key factor here. If Sophie's parents had not been willing to listen, Sophie would have been in a lot of trouble.

    Communication isn't a one-way deal: it goes both ways. Just remember: if you get into a situation like Sophie's, telling the other person how you feel-listening is the key factor to communication.

    Dining in a completely dark room, unaware what's on your plate while sitting next to a complete stranger may not sound like an ideal restaurant experience but it's certainly an intriguing way to spend a rainy night in London.

    Dans le Noir, close to London's financial district, is a restaurant full of blind waiters and waitresses who become your eyes around the restaurant, whose original Paris branch opened in 2004.

    In the bar with the light, you choose whether you want the fish, meat or vegetable, but the dishes themselves remain a secret, as do the ingredients of the “surprise” cocktails. Bags, coats and devices(设备) that light up, including watches and mobile phones, are kept in the bar. Placing your hand on the shoulder of your guide, you are led to a table in a black dining room that sets up to 60 people. And it is dark.

    The waiters tell you when the food is being placed down in front of you, then the fun begins, trying to get food into your mouth, then identifying just what it is that's on your plate, and finally whether you have missed any of it.

    It's also a great chance to break social convention and eat using your fingers. Those same fingers are also the only way you can tell how much wine you're pouring into your glass.

    The happy atmosphere in the dining room also made the night memorable. You can't really avoid talking to the person next to you at the long tables and guessing what the dishes are certainly provides adequate fuel for the conversations.

    All will be revealed at the end of the meal when you are led back out into the lit bar. Not only do you finally get to see what you've just been eating but also who you've been talking to for the last 90 minutes.

    Have you ever thought that your life will be perfect if something in your outside world changes? You may say, "I will live happily if I find my soul mate." You may say, "If the perfect job comes along, I will get satisfaction. My problem is that my boss is stupid." Or you may say, "If I have a child, I will know what it is like to be loved." The problem is that it is not the outside world that prevents you from experiencing peace, love and joy. Instead, it is your own internal (内部的) patterns that get in your way.

    To prove this point, at my weekend programs, I had my students look at a flower on my table. Then I asked them to share their experiences. Some showed a state of complete joy because staring at the flower reminded them of their wedding or a great trip with their lovers. Others said the flower made them angry because it reminded them of a gift given by a former partner who turned against them. Some students even told me that the flower reminded them of their beloved grandmothers' gardens with some shedding tears (流泪)of joy and others shedding tears of sadness. However, the flower was still just a flower.

    Our internal patterns decide whether each moment is filled with peace, anger, joy, love or sadness. When you don't realize that it is your own internal state that is creating your experience, you are likely to blame (责备)the external situations in your life. Most people aren't taught that emotion is a choice. And they aren't taught how to change those lower emotional patterns such as anger, anxiety, sadness and so on. Next time, when you meet something bad, please look at your internal state. When you accept that you are responsible for your own state, and find the courage to turn inward, you can step out of being a slave to what shows up in your external world.

The tooth is the hardest part of your body. Your teeth help you in many ways. For example, they can help you talk. They can also help you have a great smile. And the most important job of your teeth is to chew (咀嚼) your food. But do you know how your teeth grow? 

When you are born, you don't have any teeth. About 8 months later, small teeth begin to appear one by one. These teeth are called baby teeth. They are also called milk teeth. You won't have baby teeth forever. They usually begin to fall out when a child is about 6 years old. Then, permanent (永久的) teeth begin to appear. These teeth are larger and more powerful. Most people will have 28 permanent teeth by the time they are 12 years old. 

For some people, four more permanent teeth arrive by their 25th birthday. They are called wisdom teeth (智齿). But these teeth don't make you smart! Sometimes they bring you pain. If a wisdom tooth brings you too much pain, you should go to a dentist (牙医) and have it pulled out.

St. Patrick's Day, Ireland's National Day, is celebrated on 17th March every year, marking the anniversary of the day on which he passed away. St. Patrick is the most famous saint of Ireland. Born in Roman Britain, he was enslaved in Ireland at the age of 16, but he successfully escaped. Later, he returned to Ireland and brought his religious beliefs to its people.

On St Patrick's Day, Iris h families would traditionally attend church in the morning and celebrate in the afternoon. People would dance, drink, and feast on traditional meals of Irish bacon and cabbage. The Irish have observed this day as a religious holiday for over 1,000 years.

Interestingly, however, the first parade held to celebrate St Patrick's Day took place not in Ireland but in the United States. On 17th March 1762, Irish soldiers serving in the English army marched through New York City. Along with their music, the parade helped the soldiers reconnect with their Irish roots, as well as with fellow Irishmen serving in the English army.

Over 100 St. Patrick's Day parades happen across the U. S., with New York City and Boston hosting the biggest. In 1848, New York Irish Aid societies joined to create the official New York City St. Patrick's Day Parade, the world's oldest civilian（平民的） parade and the largest in the U. S. It draws over 150,000 participants and nearly 3 million spectators（观众）, lasting over five hours. Boston, Chicago, Philadelphia, and Savannah also celebrate the day with major parades.

Today, people of all background s celebrate St Patrick's Day, especially throughout the United States, Canada and Australia. It is also celebrated in many other locations far from Ireland, including Japan, Singapore, and Russia.