Answer:
I am used when you jump off a bridge for fun.
Although it sounds like I work on a transportation device I actually work in a restaurant.
I have all the knowledge you have. But I am so small that I can fit into your hands. What am I?
What is made of wood, but can't be sawed?
What kind of room has no doors or windows?
I am a animal that is cute but dangerous, what am I?