i think that the internet is very useful invention first , we can use it to search for information about what ever we want . second , we echange culture through correspending with keypals by sending and receiving messages . also , we can read electronic news paper and listen to music at any time . the internet can also be dangerous first , it wastes time and people can be addictive online . also , it has bad sites which threat teenagers . in addition , using internet for long time can heat our eyes and health in general