Answer:
I don't live within a house nor do I live without. Most will use me when they come in and again when they go out.
I always follow you around, everywhere you go at night. I look very bright to people, but I can make the sun dark. What am I?
What force and strength cannot get through, I with my unique teeth can do. What am I?
Keep doing me to avoid lens dryness
I am quick when Iām thin. I am slow when Iām fat. Wind is my worst nightmare.
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.