There is a simply mindblowing forum over on the XKCD forums from about a year and a half ago that goes into the question of "How many stars died to make me?" And the resulting speculation is simply awesome.

I think my new aspiration in life is to be knowledgeable in some context that isn't related to opinions on music or books or cars that I can post a comment on these forums that either intelligently supports or intelligently refutes a position on these forums.

Grooveshark link to "We are all made of dead stars" (Covenant vs Moby mashup)