Answer:
What points the way without a hand. It floats on water but exists on land?
Left to right Iām quite bright. Right to left I might bite.
Thousands of these come together to make a digital image. What is it?
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.
Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not
You use it between your head and your toes, the more it works the thinner it grows.