Answer:
What building has the most stories?
When the day after tomorrow is yesterday, today will be as far from Wednesday as today was from Wednesday when the day before yesterday was tomorrow. What is the day after this day?
What kind of nut is empty at the center and has no shell.
Though easy to spot, when allowed to plume, It is hard to see, when held in a room.
A hill full, a hole full, yet you cannot catch a bowl full.
Which popular cheese is made backwards?