in most lines in the following text, there is ONE unnecessary want. It is either grammatically Incorrect or does not fit in the sense of the text. For each line find this word. Some lines are correct.

 GETTING OLDER TELESCOPES YOUR PERCEPTION OF TIME

The common experience that time flies as you get old was first noted more than a hundred years ago by the psychologist William James. Now researchers proved that age really does affect your perception of time. They asked people in three aging groups to date twenty major public events such as natural disasters and political changes. The 18-21 age group thought the events had occurred more recent than they actually had, while the Over-60s dated events far too back. The middle-aged gross were the most accurate. These results show that our perception of time really does depend on age because no one knows quite why this should be. One explanation is that as we get older we accumulate generic memories of events such as Christmas and holidays. Such regular events may create the impression of time passed more quickly. Other explanation is that we perceive time in relation with our own age- when you are four, a year is a quarter of our life, but is fortieth for a 40 year old