I’m tall when I’m young, and I’m short when I’m old. What am I?

What is the fastest way to double your money?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

What do you think with the below Picture ?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

My location can be determined by the below rebus.
So where am i ?

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?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?