Answer:
What is black when you buy it, red when you use it, and gray when you throw it away?
I always run but never walk often murmur but never talk have a bed but never sleep has a mouth but never eat.
People need me yet they give me away every day.
I have numbers on my face but can't find 13 any place. What am I?
I sit high glowing and watch the world go by. Without me everything would seem dull and dangerous. What am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.