Answer:
What flares up and does a lot of good, and when it dies is just a piece of wood?
I drift forever with the current down these long canals theyβve made, Tame, yet wild, I run elusive Multitasking to your aid. Before I came, the world was darker, colder, sometimes, rougher, true. But though I might make living easy, Iβm good at killing people too.
The one who makes it, sells it. The one who buys it, never uses it. The one that uses it never knows that heβs using it.
What is that which, though black itself, enlightens the world without burning?
What looks back but cannot see?
You use it between your head and your toes, the more it works the thinner it grows.