A man plots the murder of his wife. His plan is full proof. Nobody saw them leaving their house. He stabbed her with a knife while driving. She died on the spot. He threw her body in a valley. He threw the knife carefully wiping his finger prints on a random garbage bin. Then he went back to his home and no one was watching him this time as well.

After an hour, he was called by the local police department who informed him that his wife was murdered. They asked him to reach the scene of crime immediately. But as soon as he arrived at the crime scene, he was arrested by them.

How did the police know that he himself is the murderer?

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?

I am the fastest animal but cannot climb the tree. What am I?

Why is Saturday stronger than Monday?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

John was drowned by he was not wet. How?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)