Answer:
I am what remains when nothing is left.What am I?
When does Christmas come before Thanksgiving?
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
What contains zero calories, but if you consume it, you will probably gain weight?
Who lives in a house with one bedroom, 50 hallways, and ghosts lurking everywhere?
I’m grown from darkness but shine with a pale light. Very round I am and always a lady's delight.