Teacher with spines & Hinges Riddle

Puzzle of the Day 2185 : Teacher with spines & Hinges Riddle
5 seconds Puzzle – Presence of Mind

Riddle :

I have no voice
but I can teach you
all there is to know.
I have spines & hinges
but I am not a door.
Once I’ve told you all,
I cannot tell you more.

What am I?

Answer

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