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 does an Island and the letter T have in common?

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?

Why Aeroplane windows are round?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

What number do you get when you multiply all of the numbers on a telephone's number pad?

How many bananas can you eat if your stomach is empty?

You bought me for dinner but never eat me. What am I?