Answer:
I'm a ruler with 12 agents. Half of them work in the darkness. Who am I?
They come at night without being called and are lost in the day without being stolen. What are they?
You throw me out when you use me and take me in when you are done. What am I?
I go around in circles, but always straight ahead, never complain, no matter where I am led.
I touch the Earth, I touch the sky, but if I touch you, you’ll likely die. What am I?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.