what does the below rebus means?

What Deficiency does the below rebus represent?

VIT_MIN

Where do you go to learn how to make ice cream?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

Can you find the key in the picture below?

What is the unique property of the following words ?
* Revive
* Banana
* Grammar
* Voodoo
* Assess
* Potato
* Dresser
* Uneven

10+10 and 11+11 can give you the same answer.

Explain how?

I travel all around the world but always stay in the corner. What am I?

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 always comes into a house through the keyhole?