This is one of the most quotable science articles I have read in a long time.

I would love to put some excerpts here, but I think that you will have more fun if you just read the article... ok, ok, just one: "The researcher ... also asked ... workmates about their own belly button fluff".

http://www.telegraph.co.uk/news/newstopics/howaboutthat/4883791/Revealed-The-secrets-of-belly-button-fluff.html