It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

You can see it everyday, But cannot touch it at will. What is it?

What number divided by 4 is the same as that number minus 4?

It is always ahead of me yet I can never see it. What is it?

Can you count the number of children in the picture below

Can you tell a 3D object that has just two surfaces?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

There are three boxes on a table. One of the box contains Gold and the other two are empty. A printed message contains in each box. One of the message is true and the other two are lies.

The first box says "The Gold is not here".

The Second box says "The Gold is not here".

The Third box says "The Gold is in the Second box".

Which box has the Gold?

What is the next number in the series?

15 29 56 108 208 ?

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.