Graffiti bite the dust

1.	What is meant by the term "laser"?

2.	Give two uses of lasers, other than those mentioned in the article.

3.	Describe in your own words how the laser can remove graffiti.

4.	What is the main advantage of this new technique?

5.	What is a disadvantage of using this method?

6.	What are the problems with using soda blasting or sand blasting to remove graffiti?