What Adam and Eve do not have but the rest of the people have?

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

The dirtier I get, the whiter I look. Who am I?

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

What number should come in place of the question mark below?

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Which digit occurred maximum times between the number 1 and 1000?

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?