Answer:
What do people want the least on their hands?
What starts with a 'T', ends with a 'T', and has T in it?
They have not flesh, nor feathers, nor scales, nor bone. Yet they have fingers and thumbs of their own.
I am mother and father, but never birth or nurse. I'm rarely still, but I never wander.
I am always hungry, I must always be fed. The finger I lick will soon turn red.
You use it between your head and your toes, the more it works the thinner it grows.