Answer:
What three letters change a boy into a man?
I make you weak at the worst of all times. I keep you safe I keep you fine. I make your hands sweat and your heart grow cold. I visit the weak but seldom the bold.
lighter than feather and softer than silk yet the strongest man in the world cannot hold me for more than a few minutes.
Sometimes I fly as fast as the speed of light. Sometime I crawl as slow as a snail. Unknown until I am measured but you will certainly miss me when Iām gone.
I tremble at each breath of air, and yet can heaviest burdens bear. What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?