Answer:
What word has kst in the middle, in the beginning, and at the end?
I always run but never walk, I sometimes sing but cannot talk, No head on which a hat to place, You always look me in the face.
I am what remains when nothing is left.What am I?
Voiceless it cries, Wingless flutters, Toothless bites, Mouthless mutters. What is it?
I'm the source of all emotion, but I'm caged in a white prison.
What is lighter than what it is made of?