Answer:
What invention lets you look right through a wall?
I'm white and I'm used for cutting and grinding. When I'm damaged people usually remove me. What am I?
Feed me and I live. Give me water and I die. What am I?
What is harder to catch the faster you run?
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once I've told you all, I cannot tell you more. What am I?
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.