Why 1729 is a magic number? Answer Logically.

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

Outside a tattoo artist's shop, there was a signboard which read 'I make tattoos on only them who do not tattoo themselves'.

Reading it what do you think, does the tattoo artist tattoo himself?

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

Forwards I am heavy, backward I am not. What am I?

Find the 8 in the below-given Image.

Count the number of balls in picture below:

What is black when you buy it, red when you use it, and gray when you throw it away?

What goes up but never comes down?