Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?

What always comes into a house through the keyhole?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

What happened when the wheel was invented?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

Before reading ahead, you must know the fact that only one of the people here is telling the truth.

A says that B is lying.
B says that C is lying.
C says both A and B are lying.

Can you find out who is speaking the truth?

If your uncle’s sister is not your aunt, what relation is she to you?