If 21x = 79x, what is the value of x?

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

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

What 5-letter word typed in all capital letters can be read the same upside down?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What is both possible and impossible at the same time?

I can be made.
I can be cracked.
I can be told.
I can be played.

Who am I?

Can you guess the name of the month by looking the below rebus ?

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?