Answer:
I am useless when together but useful when I am broken apart. What am I?
Cold head and feet; round as a ball; always turning around myself.
Lovely and round, I shine with pale light, Grown in the darkness, a ladyβs delight.
Used left or right I get to travel over cobblestone or gravel. Used up I vie for sweet success used down I cause men great duress.
I can be hairy and itchy all over. I can be the scariest thing you have ever seen. I stand in the middle of nowhere, hanging on a stick. What am I?
When is it bad luck to see a black cat?