1. What can fill a room but takes up no space?
2. I have lakes with no water, mountains with no stone and cities with no buildings. What am I?
3. I turn once, what is out will not get in. I turn again, what is in will not get out. What am I?
4. What is the end of everything?
5. What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?
6. A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?
7. Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?
8. What three numbers, none of which is zero, give the same result whether they’re added or multiplied?
9. What has 13 hearts, but no other organs?
10. What breaks yet never falls, and what falls yet never breaks?
