Answer:
There are two sisters: one gives birth to the other and she, in turn, gives birth to the first. Who are the two sisters?
The yellow house has yellow window, the red house has red windows, what colour windows does the green house have?
What is the largest $ amount of change you can have in your pocket without having exact change for $1?
What can you hold in your right hand but never in your left hand?
How do you discover something that does not exist?
It is something you will never see again.
Logic
Animal
Difficult
Easy
Food
Funny
Kids
What am I?