Answer:
What word when read from left to right is a ruler, but when read from right to left is a servant?
I make everyone blind. You can't see me but I will always come back for you. What am I?
Against the sun I protect your eyes and am often worn on the face of spies
My rings are not worth much, but they do tell my age. What am I?
What is it that after you take away the whole some still remains?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.