Answer:
I hide but my head is outside.
The barber of New York shave all men in New York. No man living in New York is allowed to shave himself. The barber of Nee York lives in New York. Who shaves the barber ?
What goes in the water red, and comes out black?
What is the thing which, once poured out, cannot be gathered again?
It's been around for millions of years, but is never more than a month old. What is it?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?