Answer:
What bone has a sense of humor?
I am longer than a decade and shorter than a millennium
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.
I can fall off a building and live, but in water I will die. What am I?
I have feet on my head
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.