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.

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

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

What happened when the wheel was invented?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

I can turn polar bears white.
I can make anyone dance.
I can make everyone cry
I can make your hands clap
I can make you thin.
I can make you smile.
I can make you smile

Can you guess the riddle?

Can you find the thief by just looking at the picture below?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

A father's child, a mother's child, yet no one's son.

Who am I?