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?
I walk on 4 legs in the morning, 2 legs at noon, and 3 legs at night. What am I?
I am a ship that can be made to ride the greatest waves. I am not built by objects, but built by minds. What am I?
Ten men's strength, ten men's length. Ten men can't break me, yet a young boy walks off with me. What am I?
I am gentle enough to soothe your skin, light enough to fly in the sky, strong enough to crack rocks. What am I?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?