Article explores the findings of biologist Mark Pagel: some of the words most commonly used today may have derived from a common protolanguage. The Washington Post has an interactive feature with sound samples of some of the ultraconserved words: http://www.washingtonpost.com/wp-srv/special/national/words-that-last/.
This article explains a study which proved that we tend to over estimate our pronunciation skills when learning a foreign language. It explains how our familiarity with our own accent impacts how we perceive our pronunciation. Finally, the article theorizes about how our perception of our own pronunciation can lead to "fossilization".