Knowledge: The admission cost for an adult to Granby Zoo is $40. On the other hand, Niagara Falls is free for everyone to enter and enjoy.

Conversation:
Niagara Falls seems like a nice place to visit.
Oh, yeah? I know it sits along the border between the US and Canada.
Yes, and they are pretty. Do you know the admission cost for an adult?

Response: That's great! Everyone can enjoy the site for free, as there is no admission cost.