What is the next number in this matchsticks series riddle?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

They are three errirs in this question. Can you find them?

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 more it dries, the wetter it becomes. Can you tell what it is?

Imagine you are in a room with no windows or doors. How will you get out?

The king of Octopuses has servants who have six, seven or eight legs. The distinguishing characteristics of the servants is that the one with seven legs always lie but the one with either six or eight legs speak the truth always.

One day, four servants meet and converse:

The black one says, 'We have 28 legs altogether.'

The green one says, 'We have 27 legs altogether.'

The yellow one says, 'We have 26 legs altogether.'

The red one says, 'We have 25 legs altogether.'


Can you identify the colour of the servant who is speaking the truth?

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

How can you drop a raw egg from a height onto a concrete floor without cracking it?