Answer:
I plow and plow, but never sow. What am I?
I only exist when you are here. Where you never were I can never be.
The more you have of it the less you see. What is it?
I am black of eye and bright of hair. I fast into the ground and follow my lord as he races around the world. What am I?
Without me everyone would lose their head.
What made Cyclops quit teaching?