Answer:
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once I've told you all, I cannot tell you more. What am I?
What is so delicate that saying its name breaks it?
Part carbon part water I am poison to the fishes. Many falsely claim my name I am the pause that refreshes.
I help engines spin and pants stay up. What am I?
I spend the day at the window, go to the table for meals, and hide at night. What am I?
I flow from the Homerβs mouth when he sees doughnuts.