Answer:
I am free for the taking. Through all of your life, though given but once at birth. I am less than nothing in weight, but will fell the strongest of you if held.
What number has all letters in alphabetical order when spelled out?
I drive men mad for love of me. Easily beaten, never free.
I have legs but never walk, I may have flowers but no soil, I hold food but never eat.
A circle of stones, never in rows. Stacked one on the other, mystery it sows. What is it?
It's what light turns into in the night