A conversation between a six year old child with his older sister.

6 year old boy: Sister, what is corals?
Sister: Corals are living things which could form a colony and slowly become a coral reef.
6 year old boy: I heard that all corals are beautiful.
Sister: True, however, it depends on the way you look at it.
6 year old boy: Sister, are corals useful to us?
Sister: Well, yes. They are useful to us, they are used to make medicine to cure us from some diseases or illness.
6 year old boy: Sister, is it possible that corals could cure us from terminal diseases?
Sister: Well, I am not very sure but I do believe that scientist may make use of corals to create a medicine which could cure us form terminal diseases.
6 year old boy: Ok now , Sister,I have to go to school now. Bye Bye
Sister: Bye Bye