Answer:
I drift forever with the current down these long canals they’ve 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, I’m good at killing people too.
To unravel me you need a simple key, no key that was made by locksmith's hand. But a key that only I will understand.
What I am filled, I can point the way. When I am empty. Nothing moves me. I have two skins. One without and one within.
Fuels backyard get-togethers
The sharp slim blade, that cuts the wind. What is it?
I’m grown from darkness but shine with a pale light. Very round I am and always a lady's delight.