Answer:
What invention lets you look right through a wall?
I can run but not walk. Wherever I go thought follows close behind.
My head and tail both equal are my middle slender as a bee. Whether I stand on head or heel Is quite the same to you or me. But if my head should be cut off the matter's true though passing strange directly I to nothing change.
I am gentle enough to soothe your skin, light enough to fly in the sky, strong enough to crack rocks. What am I?
Squeeze me and I cry tears as red as my flesh, but my heart is made of stone. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.