People all over the world benefits enormously from the rapidly development of the technology and science in various field. for example  a 70-inch plasma or LCD television that look no thicker than a can be easily affordable.but the main question facing the television might be the negative effects on young people.so i agree that  Movies and television have more negative effects than positive effects on the way young people behave.    Firstly watching television result in serious damage to the health of teenager.A number of studies have shown the incidence of myopia increases with watching TV.the research also indicaed that young people who watches TV over 3 hours a are eaiser to have the myopia.and as we all know there is no known way to heal it.and you should wear an unconvenient glasses in the last years in your life.and when you watch TV grogram ,you may eat some humbanger or pizza or  greasy potato chip and drink some cola or juice.and eating junk food ehhance the chance of obseity.and sadentary life can lead to backache and the pain in neck.and is also not good for children's health.       TV has a negative impact on children's behavior .the reason are twofold .For one thing ,television programs make violence,smoking and cursing appear attractive and even heroic .for another thing ,chiildren tend to copy what they consider cool on television .MY three years old nephew once use the F word .which shocked the whole family .It turned out that his father had been watching a popular but violent television series for the past week .My nephew ,repeated exposed to the F word .quickly pickly up .a recent study can back up this point.the study conducted by the china post ,has found a causal relationship between viewing violent content and agressive behavior of teenagers