Answer:
When this is found in a road you are forced to make a decision.
It's been around for millions of years, but it's no more than a month old. What is it?
I always run but never walk, I sometimes sing but cannot talk, No head on which a hat to place, You always look me in the face.
I have joy in bringing two together, but darning my existence! My life hangs by a thread, filled with ups, downs and resistance!
Kids play it and Michelangelo sculpted with it.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?