Answer:
I start with โeโ end with โeโ. I have whole countries inside me. What am I?
They are many and one, they wave and they drum, used to cover a stare, they go with you everywhere.
A spirited jig I dance bright, banishing all but darkest night. Air can't kill me but water can. Share me, I won't get less unless wind ruins me. What am I?
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
I am perfect with a head perfect without a head; Perfect with a tail perfect without a tail; Perfect with either neither or both.
Before Google, we actually had to physically look things up in this building full of knowledge.