Answer:
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
I no longer have eyes, but once I did see. Once I had thoughts, but now Iβm white and empty. What am I?
I hatch without food
Walk on the living, they donβt even mumble. Walk on the dead, they mutter and grumble. What are they?
I can run but not walk. Wherever I go thought follows close behind.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?