Answer:
Open me, and you can't see me without a mirror. Close me and you can't see me at all. What am I?
I move without wings Between silken string I leave as you find My substance behind.
I can climb mountains, cross streams, handle hundreds of feet each day, yet I never move. What am I?
You will always find me in the past. I can be created in the present, but the future can never taint me. What am I?
You heard me before and then again. Afterward I die until you call me again.
I flow from the Homerβs mouth when he sees doughnuts.