Is there a word or phrase for describing a person who is always curious?
Curiosiac?
Example usage (as requested by a comment):
The boy is such a ___, he asks questions all the time!
UPDATE
I appreciate all your answers, but my question was if there was any word – a noun – to describe a person of that kind, e.g. maniac, lunatic, weirdo, nerd, etc.
Best Answer
Inquisitive, defined by Dictionary.com