Answer:
What invention lets you look right through a wall?
What goes around the wood but never goes into the wood?
I'm a ruler with 12 agents. Half of them work in the darkness. Who am I?
I turn everything around but I cannot move. When you see me you see you!
you need thousands of me to create a digital image.
What goes up the hill and down the hill, And spite of all, yet stand still?