Not every parent looks forward to the day when their child goes off to school. In fact some parents are not sending their children to school at all. Instead they are choosing to teach their children at home. This is called homeschooling. Parents, caregivers, or private tutors educate children individually at home instead of sending them off to be formally educated in public or private schools. In the U.S. only about three percent of children are homeschooled.

    There are many reasons why some parents choose to homeschool. One reason is that some parents do not feel their children are safe in school because of bullying (恃强凌弱). It is said that bullying is very common in the school. Other parents want their children's education to be based on their religion or moral beliefs. Yet other parents think the education in school is not good enough. Homeschooling is also seen as a choice for families that live in rural areas, and families that move frequently.

    There are many different ways to homeschool, and homeschooling allows parents to design lessons based on their children's needs. Families can purchase textbooks to use or create their own materials. Some parents follow a philosophy called unschooling, which allows a child to determine when and how they want to learn based on their natural ability. Some worry that homeschooling means students won't have opportunities to communicate with others.

    To solve this problem, some families have created activities, where a group of homeschooled students will learn and play together and participate in activities that would normally happen in school like field trips.

    Besides, being homeschooled doesn't mean a student cannot go to college. Most colleges accept homeschooled students. And the homeschooled students can get the same degrees, too.

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    According to sociologists(社会学家), every modern industrial society has some form of social stratification(阶层). Class, power and status are important in deciding people's rank in society.

    Class means a person's economic position in society. A commonly used classification is lower class, middle class and upper class. While sociologists disagree on how these terms should be exactly defined, they do describe societies like the United States quite well. One study shows that 53% of Americans belong to the lower class, 46% the middle class, and 1% the upper class. Interestingly, a surgeon earning $500,000 a year and a bus driver earning $50,000 a year both regard themselves as the middle class!

    Power refers to the amount of control a person has over other people. Obviously, people in positions of great power (such as governors) exercise(行使)big power, but people who take orders from others have less power. Power and class do not always go hand in hand, however. For example, the governor of a state has great power, but he or she may not belong to a corresponding (相应的)economic class. Generally, however, there is a relationship between power and class. To our knowledge, there aren't too many people who aren't millionaires in the U．S. Senate!

    Status is the honor or respect attached to a person's position in society. It can also be affected by power and class, but not necessarily so. For example, a university professor may have a high status but not belong to a high social class or have a lot of power over others.

    What will our future look like? People have always been wondering about this question. Go on reading this text and you will know what will happen in the next fifty years.

    How can we know what the future will look like? To be able to understand the future, you must know the past. What has taken us to where we are today and what has changed along the way? The world has changed a lot in the last 150 years, but we humans are driven by the same basic needs as we were 150 years ago. Will this change in the next 150 years? No.

    What inventions have really made a difference in the last 150 years? In the past years, the inventions that have affected most people around the world for everyday living are the telephone, electricity, radio, television, computer, the car and the ability to communicate through the Internet. Then we of course have a lot of inventions that have made life easier, like new medicine, faster transports etc. In general, human beings have been working hard in the last 150 years to make the inventions so that they will be able to get control of the time and the world. Since there is still much to do in this area, this will be the focus at least for the next 150 years.

    Why do we need to predict the future? Predicting the future is important for two reasons: first we need to start to think about what kind of what kind of future we would like for ourselves and to pass on to the next generation, and then we need to know what decisions we need to make today that will give the best result in the future.

    You may need to give first aid. First aid is defined as the emergency care given to a sick or injured person. The goals of first aid are to prevent death and to prevent injuries from becoming worse.

    Each emergency condition is different. However, the following rules apply to any kind of emergency.

    Be aware of your limitations. Do not try to do more than you are able to. Nor should you do things if you are unfamiliar with them. Do what you can under the conditions at the time.

    Stay calm. Acting calmly will help the victim feel safe.

    Take a quick look to see if the victim is bleeding, and if there is a pulse.

    Keep the victim lying down and do not move him or her. You could make an injury worse if you move the victim.

    Take necessary emergency steps.

    Call for help or ask someone to make the EMS system (急救系统) start.

    Do not remove clothing unless you have to. If clothing must be removed, tear the clothes along the seams(线缝).

    Keep the victim warm. Cover the victim with a blanket. Coats and sweaters can be used if a blanket can not be found.

    Reassure (使…安心) the victim. Explain what is happening and that help has been called.

    Do not give the victim any food or fruits.

    Keep the bystanders (旁观者) away from the victim. Bystanders want to have a look, offer advice, and say something about the victim's condition. The victim may believe that the condition is worse than it really is.

    It is one of the oldest magic tricks in the book—a magician locks a woman in a box, with her head and feet sticking out from either end, and saws (锯) it in half. But when she finally jumps out of the box, the woman is unharmed.

    This trick was introduced nearly a century ago. It has been around for some time, but it never goes wrong. Why is it so successful? The answer is simple: the human mind is easily fooled.

    Our brain processes the world around us based on information that sensory organs, including the eyes, pick up. For instance, when we see a cow or a horse standing behind a tree, we automatically “fill in” the part of the animal's body that is hidden from our sight. “So the brain is taking this kind of very sparse (匮乏的) information about the world and it's generating this rich world by filling in information,” Stephen Macknik, a scientist at the Barrow Neurological Institute in Arizona, US, told Science magazine.

    But since our brains are filling in the gaps, sometimes they get it wrong. They tend to be driven by our previous experiences and we expect things to go as they have in the past even if sometimes they do not.

    This tendency explains magicians' success in fooling people with well-known coin tricks. For example, when you see a magician throw a coin up and down in one hand and then fake a coin thrown to the other hand, you would naturally believe that the coin is in the other hand.

Apart from the information gaps, magicians also use the “blind spots” theory when doing their shows.

    The most well-known experiment demonstrating this theory is called the “invisible gorilla (大猩猩)”, in which volunteers watch a video of two basketball teams. They are asked to count how many times the teams wearing white shirts pass the ball. In the meantime, a person dressed as a gorilla walks onto the court. But shockingly, half of the viewers don't notice the gorilla, even when they appear to be looking directly at it.

    Magicians employ this tactic (招数), what they call “misdirection”, in almost every one of their acts. They direct our attention somewhere else using comedy and music, which can make us miss stuff during the performance.

    Recently, a 1935 letter in which Ernest Hemingway detailed his catch of a 500lb blue marlin(青枪鱼), an adventure that is believed to have partly inspired his novel The Old Man and the Sea, has been sold for$28, 000 (£22，000).

    The handwritten letter was sent by Hemingway on 8 May to the fishing editor of the Miami Herald，telling in great detail how the author and his friend Henry Strater battled to keep sharks away from the marlin after catching it off the Bahamian island of Bimini.

    Nate D Sanders, the auction(拍卖)company which sold the letter, said it documented for the first time in Hemingway's own words not only the size of the marlin, but also the attack by sharks，reflecting the plot of the novel.

    The company added that Hemingway's account of the marlin catch differed from other anecdotes(轶事)of it, one of which described Hemingway using a machine gun on the sharks, which is said to have attracted more sharks rather than frightened them away.

    The Old Man and the Sea was also inspired by an anecdote told by Hemingway's Cuban friend Carlos Gutierrez. In 1936, Hemingway wrote in a magazine that Carlos had told him about an old fisherman who caught a great marlin alone.

    Three years later, Hemingway told his editor Max Perkins that he was planning a short story about the old commercial fisherman who fought the swordfish all alone in his sailing boat. Instead, he ended up writing For Whom the Bell Tolls, not returning to the story about the old fisherman until January 1951. It won him the Pulitzer in 1953, and was specifically mentioned when he was awarded the Nobel Prize in 1954.