Answer:
There is an ancient invention still used in some parts of the world today that allows people to see through walls. What is it?
The profession of Jimi Hendrix and Eric Clapton
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
A standard dimension for sandwiches and rulers
Tear one off and scratch my head, what once was red is black instead!
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.