Is there a word to describe a person who is always curious?

Question

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.

NVZ · Accepted Answer

Inquisitive, defined by Dictionary.com

given to inquiry, research, or asking questions; eager for knowledge; intellectually curious:

"an inquisitive mind"

unduly or inappropriately curious; prying

Greg Bacchus · Answer

Maybe someone who is "inquisitive"?

Inquisitive (adj): wanting to discover as much as you can about things, sometimes in a way that annoys people.
[Cambridge English Dictionary]

vickyace · Answer

Inquisitive is a good answer but also try pysmatic

Very questioning.

Also, quidnunc

a person who seeks to know all the latest news or gossip

Hot Licks · Answer

"Insatiable curiosity" is the term I've most often seen used in this sense.

There are nouns such as polymath which refer to people who know about lots of diverse topics, but they don't directly imply an insatiable curiosity.

Is there a word to describe a person who is always curious?

UPDATE

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