What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

Move four matchsticks to the below square to form three squares?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

Prove that the below maths equation is true.

8 + 8 = 91

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Consider this about a word: The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

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

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

I don't get anymore wetter, no matter how much rain falls on me.

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?