I have always found it fascinating that language evolves faster then humans do. I also think it's interesting how for most adults learning a new language is significantly harder then it was when they were kids. I would think that a fully developed brain would have the edge. Lastly, accents, and how some people seem to be able to just pick them up and drop them without an issue and others can barely do their own accent consistently. The human brain and language is a fascinating subject.
also: bewbs.