I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

What do you see in the image below

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

What has many keys but can’t open a single lock?

John was so frustrated to be the suspect of being a sleeper terrorist that he shoot himself right between the eyes with a revolver in his toilet. The revolver and the bullets were accurate. Minutes later John walks out of the toilet unharmed.
How can this be possible?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

What jumps when it walks and sits when it stands?

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?

A Shopkeeper collects 71 rupees in the form of 20 paisa and 25 paisa.
He collects a total of 324 coins.

Can you tell me how many number of 20-paisa and 25-paisa he got?