How can one talk without saying a single word?

Our product and our sum always give the same answer. Who are we?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

Can it be possible to build a house that has all its four walls facing towards the South?

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 13 hearts but no other organs?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

O_er_t_o_

Complete the missing letters of the given word.

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

How can you leave a room with two legs and return with six legs?