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

A dead body is found outside a multi-story multinational company. The case is reported and a homicide detective is called on the crime scene.

He looks at the body and then towards the building. From the position of the body, it is evident that the victim committed suicide. He goes to the first floor of the building and then walks in the direction of the dead body, opens the window and toss a coin in the air.

He goes to second floor and again repeats the process. He keeps doing this till he is done on all the floors. Then he returns back to the floor and tells his team that it is a murder.

How in heaven did he deduce that?

What is so fragile that saying its name breaks it?

what does the below rebus means?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

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