Answer:
I cost no money to use, or conscious effort to take part of. And as far as you can see, there is nothing to me. But without me, you are dead.
There is a puzzle which can be asked all day with a different correct answer each time. What is the puzzle?
Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not. What is it?
My life can be measured in hours, I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
My first is second in lineอพ I send shivers up your spineอพ not quite shining bright I glitter in the light.
What is so fragile that saying its name breaks it?