How can you make number one disappear by adding something to it?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

What can you deduce from the following BrainBat?

CRY
LMKI

What does below Rebus say?

XLR8

What runs around the whole yard without moving?

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

There are three boxes. One is labeled "APPLES" another is labeled "ORANGES". The last one is labeled "APPLES AND ORANGES". You know that each is labeled incorrectly. You may ask me to pick one fruit from one box which you choose.

How can you label the boxes correctly?