What is the word or phrase?

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?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

How many triangles can you find in this given picture?

What is the coolest letter in the alphabet?

What is the word or phrase?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?

O_er_t_o_

Complete the missing letters of the given word.