What Deficiency does the below rebus represent?

VIT_MIN

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

The centre of the third figure is empty. What digit should fit inside?

Why 1729 is a magic number? Answer Logically.

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

What's a single-digit number with no value?

How many triangles are there on the puzzle below?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?