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

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

There are forty elephants and they have forty-fore heads. How can this be possible?

What can you deduce from the following BrainBat?

CRY
LMKI

What is the Surname of Barbie Doll?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Find out the missing number in the picture attached:

Take one out and scratch my head, I am now black but once was red. What am I?

What question can you never answer yes to?

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?