Answer:
Without a bridle, or a saddle, across a thing I ride a-straddle. And those I ride, by help of me, though almost blind, are made to see. What am I?
What has to be broken before you can use it?
Alone I am 24th with a friend I am 20. Another friend and I am unclean.
I am bought by the yard but worn by the foot
I am gentle enough to soothe your skin, light enough to fly in the sky, strong enough to crack rocks. What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?