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Among all the fast growing science and technology,the research of human genes,or biological engineering as people call it, is drawing more and more attention now. Discussions about it are increasingly heated around the world.

The greatest thing that gene technology can do is to cure serious diseases that doctors at present can almost do nothing with, such as cancer and heart disease. Every year, millions of people are murdered by these two killers.   up to date, doctors have not found an effective way to cure them. But if the gene technology is applied,not only these two diseases can be cured completely, bringing happiness and more living days to the patients,but also the great amount of money people spend on curing their diseases can be saved. Therefore, it benefits the economy as well.In addition,human life span(寿命) can be prolonged.

Some families have genetic diseases.This means their children will for sure have the family disease,which is a great trouble for these families.Gene technology can help people give birth to more healthy and clever children.In the past,doctors could do nothing about genetic diseases.But gene technology can solve this problem perfectly.Scientists just need to find the wrong gene and correct it,and a healthy child will be born.

Some people are worrying that the gene research can be used to create human beings in large quantities. In the past few years,scientists have succeeded in cloning animals such as mice,sheep,and dogs.Therefore,these people predict that human babies would soon be cloned and that it would be beyond control,leading to some disastrous consequences.But many believe that cloned babies will not come out in large quantities,for most couples in the world can have babies in a very normal way and they also believe the governments will control gene technology and make laws to make sure the gene technology will help better our lives instead of harming us.

Most teens need about 8 to more than 9-hours of sleep each night. The right amount of sleep is essential for anyone who wants to do well in tests or sports. And lack of sleep affects everything from a person's ability to pay attention in class to his or her mood. It also damages teens' ability to do their best in athletics. Unfortunately research shows that many teens don't get enough sleep, and more than 20% of high school students fall asleep in class.

Until recently, teens were often blamed for staying up late, oversleeping for school, and falling asleep in class. But recent studies show that adolescent sleep patterns actually differ from those of adults or kids. These studies show that during the teen years, the body's biological clock is temporarily reset, telling a person to fall asleep later and wake up later. This change might arise from the fact that the brain hormone melatonin（褪黑素）is produced later at night for teens than it is for kids and adults This can make it harder for teens to fall asleep early.

These changes in the body's biological clock are in line with a time when they're busier than ever. For most teens, the pressure to do well in school is more intense than when they were kids, and it's harder to get by without studying hard. And teens also have other time demands---everything from sports and other extracurricular activities to fitting in a part-time job to save money for college.

Early start time in some schools may also play role in this sleep deficit（不足额）. Teens who fall asleep after midnight may still have to get up early for school, meaning that they may only squeeze in 6 or 7 hours of sleep a night. A couple hours of missed sleep a night may not seem like a big deal, but can create a noticeable sleep deficit over time.

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