Why Aeroplane windows are round?

Find the missing number in the sequence below:

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

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.

What is the difference between a jeweller and a jailer?

What work can one never finish?

What do you think with the below Picture ?

Solve the alphametic puzzle by replacing the alphabet with the number.

S T O R M +
S O L E S
=========
T O W E L
=========

Can you find the six hidden animals in the picture below?

If eleven plus two equals one, what does nine plus five equal?