Mommy: What…um…what have you invented?

Sara: It’s a boat.  It moves really, really fast. Too fast for Kelly to steer.

Kelly: No way.  Can’t steer it on my own.  Too powerful.

Mommy: And what do all those hoses do?

Sara: How else will the gasoline move about the boat and rev the engines?

Mommy: Yes!  Gas lines!  Of course. Why didn’t I see that?