Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

A girl was standing near the window thinking something. All of a sudden she decides something and throws something out of the window. She dies very soon after throwing it. She was perfectly healthy and had no disease or allergy. No one killed her and she did not commit suicide.

Can you think of any possible explanation that is logical as well for what happened there?

Can you find out who is the kidnapper in below Picture and why, Explain ?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

A Car driver was heading down a street in Washington. He went right past a stop sign without stopping, he turned left where there was a 'no left turn' sign and he went the wrong way on a one-way street. Then he went on the right side of the road past a cop car. Still, he didn't break any traffic laws. Why not?

A newspaper is supposed to have 60 pages, but pages 24 and 41 are missing.
Which other pages won't be there?

Why do you find that most of the buildings are deprived of the 13th floor?

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

A father's child, a mother's child, yet no one's son.

Who am I?