Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

What does below rebus means ?

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

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

What seven-letter word has hundreds of letters in it?

Can you identify if it's a murder or a suicide ?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

I have branches, but no fruit, trunk or leaves. What am I?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

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?