Answer:
Vikings use this for warmth.
This thing runs but cannot walk, sometimes sings but never talks. Lacks arms, has handsอพ lacks a head but has a face.
Forward Iโm heavy, but backwards Iโm not.
What is it that has four legs, one head, and a foot?
They have not flesh, nor feathers, nor scales, nor bone. Yet they have fingers and thumbs of their own.
You can always find me in the past. I am created in the present, but the future can not change me. What am I?