Answer:
Runs smoother than any rhyme, loves to fall but cannot climb!
Crooked as a rainbow, and slick as a plate, Ten thousand horses can't pull it straight.
I can be cracked, I can be made. I can be told, I can be played.
I am what remains when nothing is left.What am I?
My first is in some but not in all. My second is into but not in tall. My third in little but no in big. My fourth in port but not in pig. My whole is made in nature's way. For clothing, rugs used every day.
Keep doing me to avoid lens dryness
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?