Answer:
What invention lets you look right through a wall?
I mirror your actions.
I can fly but I have no wings. I can cry but I have no eyes. Wherever I go, darkness follows me. What am I?
What has 4 fingers and a thumb but isn't alive?
If lightning strikes an orchestra, who is most likely to get hit?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.