Can you convert the number zero(0) into a positive number using just one mathematical operator ?

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

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

By using 'because' continuously three times, can you make an English statement ?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

What is the next number in the series?

15 29 56 108 208 ?

You are given 16 witch hats. The hats are divided in four different colours – red, blue, green and yellow. Every colour has been assigned to four hats. Now each of the hat will be glued with a label of an arithmetic sign – ‘+’, ‘-‘, ‘x’ or ‘/’. But you can label one sign only once on one colour. In such an arrangement, the hats can be uniquely defined by its colour and symbol.

Can you arrange all the 16 hats in a 4x4 grid in a fashion that no two rows and columns have a repetition of colour or sign?
We have arranged four hats in the below picture to assist you.

What has hands, but can’t clap?

If 1+9+8=1, what is 2+8+9?

What is the riddle which can be asked all day with a different correct answer each time.