Does Iran have nukes, and what's the deal with the Nuclear Proliferation Treaty?

So Iran shot a missile a couple of days ago. Does it matter? Should we care? And what about their supposed nuclear program? Does it exist? Are we making this stuff up? And is Iran even our biggest threat? We'll talk about that, as well as Obamacare coming down to the wire, the Copenhagen climate party, and women who serve in the military.