Answer:
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
How does the man in the moon cut his hair?
What do spiders in Silicon Valley want to be when they grow up?
London bridge
What comes in many different sizes but is always one foot long
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?