It belongs to you, but other people use it more than you do. What is it?

What building has the most stories?

What demands an answer, but asks no questions

What is black when you buy it, red when you use it, and gray when you throw it away?

Look at the picture and find out which square is not linked with any of the other squares.

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

I am quite hot but become too cold if you remove the first two letters. What am I?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

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?